From October 13, 2020 onward, only these versions of Office are supported for connecting to Microsoft 365 (and Office 365) services:
Office 2016 is fully cloud-capable, touchscreen-optimized and accessible via Microsoft Web Apps to allow you to work from anywhere with any device. Upgraded Word, Excel, PowerPoint, and OneNote have been thoughtfully enhanced, with new time-saving features and a sleek modern look.
Examples of Microsoft 365 services include Exchange Online, SharePoint Online, and OneDrive for Business.
For Microsoft 365 Apps, you must be using a supported version. For a list of which versions are currently supported, see Update history for Microsoft 365 Apps.
Important
We won’t take any active measures to block other versions of the Office client that are still supported and are up to date, such as Office 2013 with Service Pack 1, from connecting to Microsoft 365 services. But these older clients may encounter performance or reliability issues over time.
Impact of using older Office clients to connect to Microsoft 365 services
After October 13, 2020, ongoing investments to our cloud services will not take into account older Office clients. Over time, these Office clients may encounter performance or reliability issues. Organizations that use these older clients will almost certainly face an increased security risk and may find themselves out of compliance depending upon specific regional or industry requirements.
Therefore, administrators should update older Office clients to versions of Office supported for connecting to Microsoft 365 services.
Upgrade resources available to administrators
We recommend that you upgrade older Office clients to a subscription version of the Office client, such as Microsoft 365 Apps for enterprise. The most up-to-date subscription versions of the Office client are always supported connecting to Microsoft 365 services.
We provide various services to help you upgrade to subscription versions of the Office client. The following list provides some examples of resources that are available:
Other changes related to connectivity to Microsoft 365 servicesRetirement of TLS 1.0 and 1.1
After October 15, 2020, you must be using at least TLS 1.2 to connect to Microsoft 365 services. For more information, see Disabling TLS 1.0 and 1.1 for Microsoft 365 and Preparing for TLS 1.2 in Office 365 and Office 365 GCC.
Basic authentication with Exchange Online
There are some changes planned related to the use of Basic Authentication with Exchange Online. For more information, see Basic Authentication and Exchange Online – September 2021 Update.
Retirement of Skype for Business Online
Skype for Business Online was retired on July 31, 2021. For more information, see Skype for Business Online retirement.
Minimum version requirements for Outlook for Windows
Note
Starting on November 1, 2021, the following versions are the minimum versions of Outlook for Windows you need to be using to be able to connect to Microsoft 365 services, such as Exchange Online.
All versions of Outlook 2019 should be able to connect to Microsoft 365 services, but only the most current version is supported.
Even though newer versions of Outlook 2013 might be able to connect to Microsoft 365 services, it's not supported and you may encounter performance or reliability issues.
Versions of Outlook that are newer than those versions listed, but aren't the most current (supported) versions, may experience connectivity issues. To find what is the most current (supported) version, see the following articles:
Additional information about connectivity to Microsoft 365 services
Some trivia about Outlook version numbers;
Version Names and Version NumbersMicrosoft Office 2016 15 19 13
The version number of Outlook relates to the first 2 numbers of the entire build number as reported in Outlook’s About dialog. side from Outlook 98, this second number is always 0.
You can look up the build number of Outlook in the following way:
Microsoft Office Professional 2016
An overview of the released versions of Outlook and their version numbers;
This version number is used for stamping the installation files of Outlook and is also used in the Registry, with the most known Registry hive being;
HKEY_CURRENT_USERSoftwareMicrosoftOffice<version>Outlook
Office 2019 is not version 17.0?
As you can see, since Outlook 2016 the version number is stuck at 16.0 and Office 2019 didn’t become version 17.0. This is because Office 2016 and Office 2019 now use the same code-base as Microsoft 365 and your license determines which features are enabled.
At the same time, this change also increases (or to be more technically correct; doesn’t decrease) compatibility with add-ins and external applications which explicitly look at the version number.
Microsoft Office 2016 15 19 14Background info
Outlook was first introduced in Office 97 which had the version number 8.0. The version numbering of Office itself skips number 5 and 6. This is because since Office 95 (version 7.0), all Office applications started sharing the same version number. Word at the time was in its 6.0 version and with that it had the highest version number. Its next version for Office 95 would become version Word 7.0 so that version number was taken for the entire Office 95 suite.
Outlook 97 replaced the applications Schedule+ and Exchange Client which were previously bundled with respectively Office and Exchange Server.
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Before Outlook 97 there were already clients called Outlook bundled with Exchange. Their names are; Outlook for MS-DOS, Outlook for Windows 3.x, and Outlook for Macintosh. After “Microsoft Outlook 2001 for Macintosh” came Entourage which offered Exchange connectivity for Mac users. Woodstock 1969 mac os. All these versions have their own version numbers which have nothing to to with the current versioning scheme.
Outlook 98 was initially a free download and later remained as a free upgrade for Outlook 97 users adding new features - most notably support for non-Exchange accounts. Its availability has been pulled shortly before the release of Outlook 2000. As its release was outside the normal release cycle of the Office suites (to which the version numbers have been tied), the version number of Outlook 98 could not be a full version higher than Outlook 97.
No version 13.0
At the MVP Summit in 2009, Steve Ballmer admitted (to little surprise) that there won’t be a version 13.0 for any of the Office applications because of “plain old superstition”. However, he also said that there is no “company policy for superstition” and that other product groups may release a 13.0 version of their product in the future. Obviously this superstition isn’t going to be localized for other markets where they would fear the number 14.
Other current uses of the Outlook brand
Outlook on the Web is the Web-based e-mail interface of Microsoft Exchange Server. Initially it was called Exchange Web Connect but soon replaced with Outlook Web Access. In Exchange 2010 and Exchange 2013 it is called Outlook Web App and was renamed to Outlook on the Web with Exchange 2016. As it is a part of Exchange, the Outlook Team doesn’t develop it. However, the release cycle of Exchange is synchronous to the Office Suite and shares the same version number since Office 2010.
Since Office for Mac 2011, Outlook replaced Entourage but has a completely different development team (they are even located in a different State!) and originally another development cycle. While it does share the same version number, originally, Office for the Mac is released 1 year after its Windows counterpart. This is no longer the case since Office 2019.
In August 2012, it was been announced that Outlook.com would replace Hotmail. While Outlook.com takes over some design elements of Outlook 2013 and OWA 2013, this was also managed by a completely different team. Taking Outlook.com into production is part of the “Wave 15” project which again matches the version number of the Office releases. As of mid-2017, all Outlook.com mailboxes are hosted by the Microsoft 365 platform and is very similar in look and feel to the corporate Outlook on the Web experience as part of Exchange Online. For various new end-user features and changes, Outlook.com often is used as a test-bed for the corporate version.
Build NumbersMicrosoft Office 2016 Free Download
The exact build number of Outlook that is shown in the About dialog relates to which updates have been installed. This often helps with troubleshooting and is also referred to as “patch level”.
Below you’ll find an overview of some of the major build numbers.
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