Effective November 1, 2021, the following versions of Outlook for Windows (starting with Outlook 2007, in a phased rollout), will not be able to connect with Office 365 Exchange and services.
|Office and Office 365 Apps||Outlook for Windows Version|
|Office 2007||All versions|
|Office 2010||All versions|
|Office 2013||Versions prior to 15.0.4971.1000 of Office 2013 (Service Pack 1 with the October 2017 Update)|
|Office 2016 MSI||Versions prior to 16.0.4600.1000 of Office 2016 (With the November 2017 Update, KB 4051890)|
|Office Pro Plus (via Office 365 Subscription)||1705 and older|
Update Outlook to ensure that you are running a supported version. To download the latest version, review the Office Desktop download eligibility and installation instructions.