From Microsoft, Effective 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. 

Office and Microsoft 365 AppsOutlook for Windows Version
Office 201315.0.4970.9999 and older
Office 201616.0.4599.9999 and older
Microsoft 365 Apps for enterprise (formerly Office 365 ProPlus)1705 and older
Microsoft 365 Apps for business (formerly Office 365 Business)1705 and older


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