Microsoft Outlook
Microsoft Outlook app icon
An email inbox in Outlook (New UI, 365/Office 2024), running on Windows 11
DeveloperMicrosoft Corporation
Initial releaseJanuary 16, 1997 (1997-01-16)
Stable release(s)
Office 2024 (LTSC)2408 (Build 17932.20700) / 10 March 2026 (2026-03-10)[1]
Office 2021 (LTSC)2108 (Build 14334.20570) / 10 March 2026 (2026-03-10)[2]
Office 2019 (LTSC)1808 (Build 10417.20108) / 10 March 2026 (2026-03-10)[3]
Office 2021-24 (Retail)2602 (Build 19725.20172) / 10 March 2026 (2026-03-10)[1][2]
Office 2019 (Retail)2509 (Build 19231.20194) / 14 October 2025 (2025-10-14)[3]
Operating systemWindows, macOS, Android, iOS
TypePersonal information manager
LicenseTrialware
Websiteoutlook.office.com

Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft 365 software suite. Primarily popular as an email client for businesses, Outlook also includes functions such as calendaring, task managing, contact managing, note-taking, journal logging, web browsing, and RSS news aggregation.

Individuals can use Outlook as a stand-alone application; organizations can deploy it as multi-user software (through Microsoft Exchange Server or SharePoint) for shared functions such as mailboxes, calendars, folders, data aggregation (i.e., SharePoint lists), and as appointment scheduling apps.

Versions

Outlook replaced Microsoft's previous scheduling and email clients, Schedule+ and Exchange Client.

Outlook 98 and Outlook 2000 offer two configurations:

Perpetual versions of Microsoft Outlook include:

Name Version number[i] Release date[4] Notes
Outlook 97 8.0 January 16, 1997 Included in Office 97 and bundled with Exchange Server 5.0 and 5.5. This was a renamed and slightly upgraded version of the Microsoft Exchange client.
Outlook 98 8.5 June 21, 1998 Freely distributed with books and magazines to cope with the newest Internet standards such as HTML email.[5] Outlook 98 setup was based on Active Setup which also installed Internet Explorer 4.[6]
Outlook 2000 9.0 June 27, 1999 Included in Office 2000 and bundled with Exchange 2000 Server
Outlook 2002 10 May 31, 2001 Included in Office XP
Outlook 2003 11 November 20, 2003 Included in Office 2003 (incl. Standard Edition for Students and Teachers) and bundled with Exchange Server 2003
Outlook 2007 12 January 27, 2007 Included in Office 2007, except Office Home and Student edition
Outlook 2010 14 July 15, 2010 Included in Office 2010 Home and Business, Standard, Professional and Professional Plus
Outlook 2011 for Mac 14 October 26, 2010 Included in Office for Mac 2011 Home and Business
Outlook 2013 15 January 29, 2013 Included in Office 2013, except Home & Student edition
Outlook for Mac 15.3 October 31, 2014 Included in Office 365, except some commercial editions
Outlook 2016 16 September 22, 2015 Included in Office 2016 and Office 365
Outlook 2016 for Mac 15.12 September 25, 2015 Included in Office 2016 and Office 365
Outlook 2019 16 September 24, 2018 Included in Office 2019 and Office 365
Outlook 2019 for Mac 16.17 September 24, 2018 Included in Office 2019 and Office 365
Outlook for Phones & Tablets 1.3 2015 Included in Office 365, except some commercial editions

Includes iOS and Android support

Microsoft Outlook

Microsoft Outlook is an email and personal information manager software primarily used in professional settings. As part of the Microsoft Office suite, it offers email management, contact storage, calendar scheduling, and task tracking. Outlook can function independently or as part of a larger Microsoft ecosystem, including integration with SharePoint for file sharing. While it stores email data locally for offline access, newer versions restrict link opening to Microsoft's own browsers.[7][5]

Privacy is severely degraded in the latest versions, as the new Outlook sends passwords, mails and other data to Microsoft.[8][9]

Outlook 2002

Outlook 2002 introduced these new features:[10]

Outlook 2003

Outlook 2003 introduced these new features:[15]

Outlook 2007

Features that debuted in Outlook 2007 include:[19]

Outlook 2010

Features that debuted in Outlook 2010 include:[25]

Outlook 2013

Features that debuted in Outlook 2013, which was released on January 29, 2013, include:

Outlook 2016

Features that debuted in Outlook 2016 include:[26]

Outlook 2019

Features that debuted in Outlook 2019 include:[27]

Outlook 2024

Macintosh

Microsoft made several versions of Outlook for older Mac computers, but only for email accounts on specific company servers (Exchange). It was not included as part of the regular Microsoft Office package for Mac.

Microsoft Entourage was Microsoft's email app for Mac. It was similar to Outlook but didn't work well with Exchange email at first. Over time, it got better at handling Exchange, but it was always a different program than Outlook.

Entourage was replaced by Outlook for Mac 2011, which features greater compatibility and parity with Outlook for Windows than Entourage offered. It is the first native version of Outlook for macOS.

Outlook 2011 initially supported Mac OS X's Sync Services only for contacts, not events, tasks or notes. It also does not have a Project Manager equivalent to that in Entourage.[28] With Service Pack 1 (v 14.1.0), published on April 12, 2011, Outlook can now sync calendar, notes and tasks with Exchange 2007 and Exchange 2010.

On October 31, 2014, Microsoft released Outlook for Mac (v15.3 build 141024) with Office 365 (a software as a service licensing program that makes Office programs available as soon as they are developed).[29] The "New Outlook for Mac" client, included with version 16.42 and above, became available for "Early Insider" testers in the fall of 2019, with a public "Insider" debut in October 2020.[30][31] It requires macOS 10.14 or greater and introduces a redesigned interface with significantly changed internals, including native search within the client that no longer depends on macOS Spotlight.[32] Some Outlook features are still missing from the New Outlook client as it continues in development.[33]

To date, the Macintosh client has never had the capability of syncing Contact Groups/Personal Distribution Lists from Exchange, Microsoft 365 or Outlook.com accounts, something that the Windows and web clients have always supported.[34] A UserVoice post created in December 2019 suggesting that the missing functionality be added has shown a "Planned" tag since October 2020.[35]

In March 2023, Microsoft announced that Outlook for Mac will be available for free. This means that users no longer need a Microsoft 365 subscription or an Office licence to use the program.[36]

Phones and tablets

First released in April 2014 by the venture capital-backed startup Acompli, the company was acquired by Microsoft in December 2014. On January 29, 2015, Acompli was re-branded as Outlook Mobile—sharing its name with the Microsoft Outlook desktop personal information manager and Outlook.com email service.[37] In January 2015, Microsoft released Outlook for phones and for tablets (v1.3 build) with Office 365.[38] This was the first Outlook for these platforms with email, calendar, and contacts.

On February 4, 2015, Microsoft acquired Sunrise Calendar;[39] on September 13, 2016, Sunrise ceased to operate, and an update was released to Outlook Mobile that contained enhancements to its calendar functions.[40][41]

Similar to its desktop counterpart, Outlook mobile offers an aggregation of attachments and files stored on cloud storage platforms; a "focused inbox" highlights messages from frequent contacts, and calendar events, files, and locations can be embedded in messages without switching apps. The app supports a number of email platforms and services, including Outlook.com, Microsoft Exchange and Google Workspace (formerly G Suite) among others.

Outlook mobile is designed to consolidate functionality that would normally be found in separate apps on mobile devices, similar to personal information managers on personal computers. It is designed around four "hubs" for different tasks: "Mail", "Calendar," "Files" and "People". The "People" hub lists frequently and recently used contacts and aggregates recent communications with them, and the "Files" hub aggregates recent attachments from messages, and can also integrate with other online storage services such as Dropbox, Google Drive, and OneDrive.[42][43][44][45][46] To facilitate indexing of content for search and other features, emails and other information are stored on external servers.[47]

Outlook mobile supports a large number of different e-mail services and platforms, including Exchange, iCloud, Gmail, Google Workspace (formerly G Suite), Outlook.com, and Yahoo! Mail.[48][49] The app supports multiple email accounts at once.[50]

Emails are divided into two inboxes: the "Focused" inbox displays messages of high importance, and those from frequent contacts. All other messages are displayed within an "Other" section.[47][51] Files, locations, and calendar events can be embedded into email messages. Swiping gestures can be used for deleting messages.[44][52][53][54]

Like the desktop Outlook, Outlook mobile allows users to see appointment details, respond to Exchange meeting invites, and schedule meetings. It also incorporates the three-day view and "Interesting Calendars" features from Sunrise.[55]

Files in the Files tab are not stored offline; they require Internet access to view.

Security

Outlook mobile temporarily stores and indexes user data (including email, attachments, calendar information, and contacts), along with login credentials,[56] in a "secure" form on Microsoft Azure servers located in the United States.[57] On Exchange accounts, these servers identify as a single Exchange ActiveSync user in order to fetch e-mail. Additionally, the app does not support mobile device management, nor allows administrators to control how third-party cloud storage services are used with the app to interact with their users. Concerns surrounding these security issues have prompted some firms, including the European Parliament, to block the app on their Exchange servers.[58][59][60] Microsoft maintains a separate, pre-existing Outlook Web Access app for Android and iOS.[60]

Outlook Groups

Outlook Groups was a mobile application for Windows Phone, Windows 10 Mobile, Android and iOS that could be used with an Office 365 domain Microsoft Account, e.g. a work or school account. It is designed to take existing email threads and turn them into a group-style conversation. The app lets users create groups, mention their contacts, share Office documents via OneDrive and work on them together, and participate in an email conversation. The app also allows the finding and joining of other Outlook Groups. It was tested internally at Microsoft and launched September 18, 2015, for Windows Phone 8.1 and Windows 10 Mobile users.[61]

After its initial launch on Microsoft's own platforms the application was released for Android and iOS on September 23, 2015.[62]

Outlook Groups was updated on September 30, 2015 to introduce a deep linking feature as well as fix a bug that blocked the "send" button from working. In March 2016 Microsoft added the ability to attach multiple images and the most recently used document to group messages, as well as the option to delete conversations within the application program.[63]

Outlook Groups was retired by Microsoft on May 1, 2018.[64] The functionality was replaced by adding the "Groups node" to the folder list within the Outlook mobile app.[65]

Internet standards compliance

HTML rendering

Outlook 2007 was the first Outlook to switch from the Internet Explorer rendering engine to Microsoft Word 2007's. This meant that HTML and Cascading Style Sheets (CSS) items not handled by Word were no longer supported. On the other hand, HTML messages composed in Word look as they appeared to the author.[66] This affects publishing newsletters and reports, because they frequently use intricate HTML and CSS to form their layout. For example, forms can no longer be embedded in an Outlook email.

Support of CSS properties and HTML attributes

Outlook for Windows has very limited CSS support compared to various other e-mail clients. Neither CSS1 (1996) nor CSS2 (1998) specifications are fully implemented and many CSS properties can only to be used with certain HTML elements for the desired effect.[67] Some HTML attributes help achieve proper rendering of e-mails in Outlook, but most of these attributes are already deprecated in the HTML 4.0 specifications (1997).[68] In order to achieve the best compatibility with Outlook, most HTML e-mails are created using multiple boxed tables, as the table element and its sub-elements support the width and height property in Outlook. No improvements have been made towards a more standards-compliant email client since the release of Outlook 2007.[69]

Transport Neutral Encapsulation Format

Outlook and Exchange Server internally handle messages, appointments, and items as objects in a data model which is derived from the old proprietary Microsoft Mail system, the Rich Text Format from Microsoft Word and the complex OLE general data model.[70] When these programs interface with other protocols such as the various Internet and X.400 protocols, they try to map this internal model onto those protocols in a way that can be reversed if the ultimate recipient is also running Outlook or Exchange.[71]

This focus on the possibility that emails and other items will ultimately be converted back to Microsoft Mail format is so extreme that if Outlook/Exchange cannot figure out a way to encode the complete data in the standard format, it simply encodes the entire message/item in a proprietary binary format called Transport Neutral Encapsulation Format (TNEF) and sends this as an attached file (usually named "winmail.dat") to an otherwise incomplete rendering of the mail/item. If the recipient is Outlook/Exchange it can simply discard the incomplete outer message and use the encapsulated data directly, but if the recipient is any other program, the message received will be incomplete because the data in the TNEF attachment will be of little use without the Microsoft software for which it was created.[71] As a workaround, numerous tools for partially decoding TNEF files exist.

Calendar compatibility

Outlook does not fully support data and syncing specifications for calendaring and contacts, such as iCalendar, CalDAV, SyncML, and vCard 3.0. Outlook 2007 claims to be fully iCalendar compliant; however, it does not support all core objects, such as VTODO or VJOURNAL.[72] Also, Outlook supports vCard 2.1 and does not support multiple contacts in the vCard format as a single file. Outlook has also been criticized for having proprietary "Outlook extensions" to these Internet standards.

.msg format

Outlook (both the web version and recent non-web versions) promotes the usage of a proprietary .msg format[73] to save individual emails, instead of the standard .eml format. Messages use .msg by default when saved to disk or forwarded as attachments. Compatibility with past or future Outlook versions is not documented nor guaranteed;[74] the format saw over 10 versions released since version 1 in 2008.[73]

The standard .eml format replicates the format of emails as used for transmission and is therefore compatible with any email client which uses the normal protocols. Standard-compliant email clients, like Mozilla Thunderbird, use additional headers to store software-specific information related e.g. to the local storage of the email, while keeping the file plain-text, so that it can be read in any text editor and searched or indexed like any document by any other software.

Security concerns

As part of its Trustworthy Computing initiative, Microsoft took corrective steps to fix Outlook's reputation for a lack of security in Office Outlook 2003. Among the most publicized security features are that Office Outlook 2003 does not automatically load images in HTML emails or permit opening executable attachments by default, and includes a built-in Junk Mail filter.[75] Service Pack 2 has augmented these features and adds an anti-phishing filter.[76]

Outlook add-ins

Outlook add-ins are small additional programs for the Microsoft Outlook application, mainly purposed to add new functional capabilities into Outlook and automate various routine operations. The term also refers to programs where the main function is to work on Outlook files, such as synchronization or backup utilities. Outlook add-ins may be developed in Microsoft Visual Studio[77] or third-party tools such as Add-in Express. Outlook add-ins are not supported in Outlook Web App.

From Outlook 97 on, Exchange Client Extensions are supported in Outlook. Outlook 2000 and later support specific COM components called Outlook Add-Ins. The exact supported features (such as .NET components) for later generations were extended with each release.

SalesforceIQ Inbox for Outlook

In March 2016, Salesforce announced that its relationship intelligence platform, SalesforceIQ, would be able to seamlessly integrate with Outlook.[78] SalesforceIQ works from inside the Outlook inbox providing data from CRM, email, and customer social profiles. It also provides recommendations within the inbox on various aspects like appointment scheduling, contacts, responses, etc.

Hotmail Connector

Microsoft Outlook Hotmail Connector (formerly Microsoft Office Outlook Connector), is a discontinued and defunct free add-in for Microsoft Outlook 2003, 2007 and 2010, intended to integrate Outlook.com (formerly Hotmail) into Microsoft Outlook. It uses DeltaSync, a proprietary Microsoft communications protocol that was formerly used by Hotmail.[79]

In version 12, access to tasks and notes and online synchronization with MSN Calendar is only available to MSN subscribers of paid premium accounts. Version 12.1, released in December 2008 as an optional upgrade, uses Windows Live Calendar instead of the former MSN Calendar. This meant that calendar features became free for all users, except for task synchronization which became unavailable. In April 2008, version 12.1 became a required upgrade to continue using the service as part of a migration from MSN Calendar to Windows Live Calendar.[80]

Microsoft Outlook 2013 and its newer versions have intrinsic support for accessing Outlook.com and its calendar over the Exchange ActiveSync (EAS) protocol,[81] while older versions of Microsoft Outlook can read and synchronize Outlook.com emails over the IMAP protocol.[82]

Social Connector

Outlook Social Connector was a free add-in for Microsoft Outlook 2003 and 2007 by Microsoft that allowed integration of social networks such as Facebook, LinkedIn and Windows Live Messenger into Microsoft Outlook.[83] It was first introduced on November 18, 2009.[84] Starting with Microsoft Office 2010, Outlook Social Connector is an integral part of Outlook.[85]

CardDAV and CalDAV Connector

Since Microsoft Outlook does not support CalDAV and CardDAV protocol along the way, various third-party software vendors developed Outlook add-ins to enable users synchronizing with CalDAV and CardDAV servers. Nextcloud recommends the Open Source Caldavsynchronizer.[86] CalConnect[87] listed software that enables users to synchronize their calendars with CalDAV servers/contacts with CardDAV servers, but most of them are outdated.

Importing from other email clients

Traditionally, Outlook supported importing messages from Outlook Express and Lotus Notes. In addition, Microsoft Outlook supports POP3 and IMAP protocols, enabling users to import emails from servers that support these protocols. Microsoft Hotmail Connector add-in (described above) helps importing emails from Hotmail accounts. Outlook 2013 later integrated the functionality of this add-in and added the ability to import email (as well as a calendar) through Exchange ActiveSync protocol.[81]

There are multiple methods to get the emails from Thunderbird. The first is to use a tool[88] that can convert a Thunderbird folder to a format that can be imported from Outlook Express. This method must be processed folder by folder. The other method is to use some free tools that keep the original folder structure.[89] If Exchange is available, an easier method is to connect the old mail client (Thunderbird) to Exchange using IMAP, and upload the original mail from the client to the Exchange account.[90]

New Outlook for Windows

In May 2022, Microsoft announced a preview release of new Outlook for Windows, available initially to Office Insiders. The new version of Outlook is a progressive web app based on Outlook.com and offers several new features.[91]

The new Outlook for Windows preview later became available to all existing Outlook for Windows users and also users of the free Mail and Calendar app, which was retired in favor of the new app on December 31, 2024.[92][93][94]

The new Outlook has been criticized for having worse performance compared to the previous native versions as well as lack of offline support and missing a unified inbox.[95] Privacy concerns have also been raised around the decision to synchronise non-Microsoft email accounts with the Microsoft cloud, rather than downloading emails to the local device as previous versions have done.[96]

Reception

See also

References

Notes

  1. The version numbers follows the Office numbers.

Citations

  1. "Update history for Office LTSC 2024 and Office 2024". Microsoft Learn.
  2. "Update history for Office LTSC 2021 and Office 2021". Microsoft Learn.
  3. "Update history for Office 2016 C2R and Office 2019". Microsoft Learn.
  4. "Microsoft Outlook Life-cycle Information". Archived from the original on March 1, 2013.
  5. Singh, Rohit (June 3, 2021). "The Ultimate Guide to Convert Outlook OST to PST File". Cigati Solutions. Archived from the original on January 4, 2023.
  6. "OL98: How to Troubleshoot Active Setup Problems in Windows 98, 98 SE or ME". Support (3.1 ed.). January 29, 2007. Archived from the original on March 16, 2007.
  7. "Microsoft is forcing Outlook and Teams to open links in Edge, and IT admins are angry". May 3, 2023. Archived from the original on May 4, 2023.
  8. "Warning: New Outlook sends passwords, mails and other data to Microsoft". November 10, 2023. Archived from the original on November 14, 2023.
  9. "Microsoft krallt sich Zugangsdaten: Achtung vor dem neuen Outlook". November 9, 2023. Archived from the original on November 15, 2023.
  10. "Microsoft Outlook 2002 Product Guide". Microsoft. May 30, 2001. Archived from the original (DOC) on February 7, 2003.
  11. "Microsoft Outlook 2002 Performance Tuning". Microsoft. June 7, 2001. Archived from the original (DOC) on October 4, 2003.
  12. "OL2002: Users Can Read Nonsecure E-mail as Plain Text". Support. Microsoft. Archived from the original on October 20, 2004.
  13. Mosher, Sue (August 26, 2002). "Office XP SP2 Brings Changes to Outlook". Windows IT Pro. Penton.{{cite web}}: CS1 maint: deprecated archival service (link)
  14. Mosher, Sue (March 25, 2004). "Tighter Security in Outlook 2002 SP2". Windows IT Pro. Penton.{{cite web}}: CS1 maint: deprecated archival service (link)
  15. "Microsoft Office 2003 Editions Product Guide". Microsoft. September 2003. Archived from the original (DOC) on November 4, 2005.
  16. Harkins, Susan (April 22, 2008). "How do I... Avoid e-mail spam using Outlook tools?". TechRepublic. CBS Interactive. Archived from the original on December 24, 2013.
  17. Rist, Oliver (August 20, 2004). "You have nothing to fear from Office 2003 SP1". InfoWorld. IDG. Archived from the original on December 31, 2017.
  18. Yegulalp, Serdar. "Microsoft Office 2003 SP2's antiphishing filter for Outlook". SearchExchange. TechTarget. Archived from the original on January 1, 2018.
  19. "What's new in Microsoft Office Outlook 2007". Support. Microsoft. Archived from the original on January 23, 2010.
  20. Bruzzese J., Peter (February 4, 2008). "Outlook 2007 vs. Outlook 2003". Windows IT Pro. Penton. Archived from the original on January 3, 2018.
  21. "Discontinued features and modified functionality in Outlook 2007". Support. Microsoft. Archived from the original on December 27, 2009.
  22. "Outlook Mobile Service - How it works? Advantages? Features?". MSDN. Microsoft. April 9, 2008. Archived from the original on January 2, 2018.
  23. Posey, Brian (April 21, 2009). "How Windows Desktop Search works in Microsoft Outlook 2007". SearchExchange. TechTarget. Archived from the original on September 27, 2010.
  24. Byrne, Randy; Gregg, Ryan (2007). "Chapter 2: Outlook as a Platform". MSDN. Microsoft. Archived from the original on January 3, 2018.
  25. "What's new in Microsoft Outlook 2010". Support. Microsoft. Archived from the original on March 11, 2016.
  26. "What's new in Outlook 2016 for Windows". June 30, 2023. Archived from the original on April 15, 2017.
  27. "What's new in Outlook 2019". Archived from the original on November 12, 2020.
  28. Welsh, John C. (October 1, 2010). "Microsoft Outlook for Mac 2011". Macworld. IDG. Archived from the original on August 15, 2016.
  29. "New Outlook for Mac available to Office 365". Office Blogs. Microsoft. October 31, 2014. Archived from the original on November 3, 2014.
  30. TimDavenport. "Release notes for Office for Mac - Office release notes". docs.microsoft.com. Archived from the original on April 16, 2021.
  31. Warren, Tom (September 22, 2020). "Microsoft's new Outlook for Mac design launches in October". The Verge. Archived from the original on April 30, 2021.
  32. "The new Outlook for Mac - Under the Hood". TECHCOMMUNITY.MICROSOFT.COM. September 18, 2020. Archived from the original on April 13, 2021.
  33. "The new Outlook for Mac". support.microsoft.com. Archived from the original on January 22, 2021.
  34. "Sync basics - what you can and cannot sync". support.microsoft.com. Archived from the original on April 13, 2021.
  35. Roy, Thomas. "Support for contact lists (not contact groups!)". Got an idea?. Archived from the original on April 13, 2021.
  36. Warren, Tom (March 6, 2023). "Microsoft makes Outlook for Mac free to use". The Verge. Archived from the original on March 6, 2023.
  37. "Microsoft rebrands Acompli as Outlook for iOS and Android". The Verge. January 29, 2015. Archived from the original on January 16, 2021.
  38. Compare: "Office on iOS and Android". Office Blogs. Microsoft. January 29, 2015. Archived from the original on January 29, 2015.
  39. Miners, Zach (February 4, 2015). "Microsoft reportedly buying slick calendar app Sunrise to bolster productivity push". PC World. Archived from the original on September 30, 2020.
  40. Warren, Tom (September 1, 2016). "Microsoft isn't killing the Sunrise calendar app just yet". The Verge. Archived from the original on November 8, 2020.
  41. "Microsoft Outlook's mobile app just added Sunrise's best features". The Verge. Vox Media. September 13, 2016. Archived from the original on November 8, 2020.
  42. "Acompli brings its Exchange-friendly email app to Android". The Verge. Vox Media. September 4, 2014. Archived from the original on November 11, 2020.
  43. Gannes, Liz (February 20, 2014). "Acompli, From Zimbra and VMware Vets, Tees Up a Swing at Mobile Email". Re/code. Archived from the original on March 14, 2016.
  44. Bowen, Andy (May 3, 2014). "Test-driving Acompli: Could an email app be reason enough to go back to the iPhone?". Engadget. Archived from the original on July 26, 2020.
  45. Bell, Karissa (April 24, 2014). "Acompli Launches App to Simplify Mobile Email". Mashable. Archived from the original on November 12, 2020.
  46. Stern, Joanna (April 29, 2014). "You're Emailing Wrong: The Best Mobile Apps for Managing Your Inbox". The Wall Street Journal. Archived from the original on October 8, 2020.
  47. Redmond, Tony. "Do the ex-Acompli now Outlook clients really compromise security or is everyone overreacting?". Windows IT Pro. Penton. Archived from the original on September 1, 2016.
  48. Langshaw, Mark (April 30, 2014). "Best new mobile apps for iOS, Android: IFTTT, miDrive, more". Digital Spy. Archived from the original on April 13, 2020.
  49. Dredge, Stuart (April 28, 2014). "20 best iPhone and iPad apps this week". The Guardian. Archived from the original on July 24, 2020.
  50. Kendrick, James. "Acompli for iOS review: Must-have app for BYOD". ZDNet. CBS Interactive. Archived from the original on August 8, 2020.
  51. "Better email apps for your iPhone". CNET. CBS Interactive. Archived from the original on October 8, 2020.
  52. Vogel, Sandra (September 15, 2014). "Mobile app of the day: Acompli". ITProPortal. Archived from the original on July 26, 2020.
  53. P., Daniel (September 12, 2014). "Accompli arrives for Android: intelligent email wrapped in calendar and cloud storage". PhoneArena. Archived from the original on September 27, 2020.
  54. Williams, Owen (April 27, 2014). "Acompli: a Perfect iOS Email App but We Wish it Wasn't Free". The Next Web. Archived from the original on November 28, 2020.
  55. "Introducing Outlook's new and improved calendar on iOS and Android". Microsoft 365 Blog. September 13, 2016. Archived from the original on April 21, 2021.
  56. "New access and security controls for Outlook for iOS and Android". Office Blogs. June 10, 2015. Archived from the original on July 20, 2020.
  57. "Outlook for iOS and Android". Microsoft TechNet. Archived from the original on April 13, 2020.
  58. "Outlook for iOS, Android flagged for inherent security flaws". NetworkWorld. February 2, 2015. Archived from the original on April 28, 2024.
  59. "Security issues lead IT to block Outlook for iOS". TechTarget. Archived from the original on September 21, 2020.
  60. "EU Parliament blocks new Outlook apps over privacy concerns". IT World. February 9, 2015. Archived from the original on April 24, 2017.
  61. "Outlook Groups app is now available for Windows 10 Mobile and Windows Phone 8.1". Windows Central. September 19, 2015. Archived from the original on June 29, 2016.
  62. Edmonds, Rich (September 23, 2015). "Microsoft releases Outlook Groups for Android to help you engage with your team". Android Central. Archived from the original on November 17, 2016.
  63. Allison, Michael (March 29, 2016). "Outlook Groups for iOS updated with new features". MSPowerUser. Archived from the original on September 20, 2020.
  64. "Outlook Groups app is retiring". Archived from the original on August 10, 2020.
  65. "Use Groups in the Outlook mobile app". Archived from the original on November 12, 2020.
  66. "Microsoft Outlook 2007 Report | Email Standards Project". email-standards.org. Archived from the original on November 24, 2010.
  67. "CSS Support Guide for Email Clients – Campaign Monitor". Archived from the original on January 15, 2021.
  68. "HTML 4.0 Specification". Archived from the original on July 27, 2008.
  69. "A designer's guide to Outlook 2013 and Office 365". Archived from the original on November 28, 2014.
  70. Outlook Data Model Reference (page on the MailItem object class members), MSDN development documentation, [1] Archived November 23, 2011, at the Wayback Machine, retrieved May 2011
  71. Transport-Neutral Encapsulation Format (TNEF) | Outlook 2010 Archived May 20, 2017, at the Wayback Machine. Microsoft. July 28, 2014. Retrieved May 29, 2020.
  72. "Microsoft Office 2003 editions comparison". Microsoft. Archived from the original on January 7, 2021.
  73. "[MS-OXMSG]: Outlook Item (.msg) File Format". February 15, 2022.
  74. Dane (MS). "Archiving emails in msg format". Archived from the original on May 20, 2021.
  75. "Microsoft Outlook 2003: Using Junk E-mail Filters". uwec.edu. University of Wisconsin-Eau Claire. Archived from the original on July 4, 2017.
  76. "Microsoft Internet Safety and Security Center". Microsoft. Archived from the original on June 4, 2011.
  77. "Top 10 Reasons to Use Outlook". PCWorld. February 10, 2009. Archived from the original on September 17, 2020.
  78. Miller, Ron (March 10, 2016). "Salesforce-Microsoft love grows with SalesforceIQ-Outlook integration | TechCrunch". Archived from the original on November 29, 2020.
  79. "Microsoft Office Outlook Hotmail Connector overview". Microsoft Office website. Microsoft.{{cite web}}: CS1 maint: deprecated archival service (link)
  80. "Transition information for former Office Live Small Business customers – Manage Office 365 – Office 365 – Microsoft Office 365 Community". Ask.officelive.com. Archived from the original on March 23, 2020.
  81. "What's new in Outlook 2013". TechNet Library. Microsoft. December 11, 2012. Archived from the original on September 21, 2020.
  82. "Add your Outlook.com account in Outlook for Windows". Office Support. Microsoft. Archived from the original on November 11, 2020.
  83. Thomas, Doug (August 24, 2010). "How to install the Outlook Social Connector (video)". Office Casual blog. Microsoft. Archived from the original on August 3, 2020.
  84. "Announcing the Outlook Social Connector". Outlook Blog. Microsoft. November 18, 2009. Archived from the original on December 25, 2012.
  85. "Changes in Outlook 2010 (for IT pros)". TechNet Library. Microsoft. November 27, 2012. Archived from the original on August 29, 2014.
  86. Poortvliet, Jos (November 14, 2016). "Nextcloud offers CalDav Synchronizer for Outlook users". Nextcloud.
  87. "CalDAV Clients". Archived from the original on May 23, 2016.
  88. "IMAPSize". Archived from the original on November 22, 2010.
  89. "Export messages and folders from Thunderbird to Outlook/Outlook Express/Windows Mail". April 14, 2009. Archived from the original on May 2, 2009.
  90. "How to Merge PST Files | PST Merge Tool". www.howtomergepstfiles.com. Archived from the original on November 8, 2020.
  91. "The new Outlook for Windows helps you be more productive and in control of your inbox". Archived from the original on August 29, 2023.
  92. "Outlook for Windows: The Future of Mail, Calendar, and People on Windows 11 - Microsoft Support". support.microsoft.com.
  93. "Microsoft Outlook for Windows Preview | Microsoft 365". www.microsoft.com. Archived from the original on September 23, 2023.
  94. "Getting started with the new Outlook for Windows - Microsoft Support". support.microsoft.com. Archived from the original on September 7, 2023.
  95. "Even Microsoft's AI says the new Outlook is worse than Mail & Calendar on Windows 11". Windows Central. July 5, 2024.
  96. Alexander, Elliot (November 27, 2023). "Microsoft's new Outlook client quietly moves your email to the cloud". XDA.