From Microsoft Corporation
Technical Bulletin MC288472 · Published Sep 30, 2021 · Last updated Oct 8, 2021
Action required by Nov 1, 2021
Microsoft 365 and Outlook
Message Summary
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 Apps | Outlook for Windows Version |
| Office 2007 | All Versions |
| Office 2010 | All Versions |
| Office 2013 | 15.0.4970.9999 and older |
| Office 2016 | 16.0.4599.9999 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 |
Key Points:
- Major: Retirement
- Timing: Beginning November 1, 2021 and will be complete by mid-May 2022.
- Action: Ensure Outlook for Windows client are updated accordingly
How this will affect your organization:
Versions that are newer than minimum version requirements listed above, but are not the currently supported version, may experience connectivity issues.
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 2013 and 2016).
Supported versions of Outlook for Windows in Office and Microsoft 365 will continue to connect to Microsoft 365 services as expected.
What you need to do to prepare:
We recommend that all users upgrade to the supported versions of Office and Microsoft 365 Apps.
