To see a list of the currently supported versions, visit Update history for Microsoft 365 Apps (listed by date) (for Microsoft 365 Apps) or Latest updates for versions of Office that use Windows Installer (MSI) (see “Latest Public Update” for Office 20). Versions that are newer than minimum version requirements listed above, but are not the currently supported version, may experience connectivity issues. Action: Ensure Outlook for Windows client are updated accordingly.Timing: Beginning Novemand will be complete by mid-May 2022.

Microsoft 365 Apps for business (formerly Office 365 Business) Microsoft 365 Apps for enterprise (formerly Office 365 ProPlus) For more information, see Microsoft Lifecycle Policy.Starting November 1, 2021, the following versions of Outlook for Windows, as part of Office and Microsoft 365 Apps, will not be able to connect with Office 365 and Microsoft 365 services. For previous versions of Outlook, only those that have extended support may continue to work with Microsoft 365, although with reduced functionality. Microsoft 365 works with any version of Outlook that is in mainstream support, which includes the latest version of Outlook 2016. Outlook compatibility with Microsoft 365 and your on-premises environment depends on the system requirements for your deployment: For more information about installing Office updates, see Install Office updates.To find out what version of Outlook you're using, see What version of Outlook do I have?.The information in this article doesn't apply to Microsoft 365 Apps.For example, if you installed a volume licensed version of Outlook, such as Outlook included with Office Professional Plus 2016. The information in this article only applies to perpetual versions of Outlook that use the Windows Installer (MSI) installation technology.

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