check before: 2021-11-01
Exchange, Microsoft 365 Apps, Outlook
Mac, Online, Windows Desktop, World tenant
Admin impact, Retirement, Updated message, User impact
Updated October 08, 2021: We have updated the content below with additional details for clarity. Thank you for your feedback.
30-day/Final Reminder (MC229143 - DEC '20 and MC274503 - July '21): To ensure that we meet performance expectations, we are updating the supported versions of Outlook for Windows that can connect to Microsoft 365 services.
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.
Office and Microsoft 365 AppsOutlook for Windows Version
Office 2007All Versions
Office 2010All Versions
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
Timing: Beginning November 1, 2021 and will be complete by mid-May 2022.
Action: Ensure Outlook for Windows client are updated accordingly
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Last updated 2 weeks ago