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Oklahoma State University

End of Life - Microsoft Outlook for Windows

Microsoft has announced that they will be updating the supported versions of Outlook for Windows that can connect to Microsoft 365 services. Effective November 1, 2021, the following versions of Outlook, as part of Office and Microsoft 365 Apps, will not be able to connect with Office 365 and Microsoft 365 services:

Office 2013
-Outlook for Windows Version: 15.0.4970.9999 and older

Office 2016
-Outlook for Windows Version: 16.0.4599.9999 and older
-Microsoft 365 Apps for enterprise (formerly Office 365 ProPlus)
-Outlook for Windows Version: 1705 and older
-Microsoft 365 Apps for business (formerly Office 365 Business)
-Outlook for Windows Version: 1705 and older

All users are recommended to upgrade to the supported versions of Office and Microsoft 365 Apps to avoid connectivity issues. To see a list of currently supported versions, please visit:

For Microsoft 365 Apps:

For Office 2013 and 2016:
Campuses Affected:
  • OSU-Stillwater
  • OSU-Tulsa
  • OSU Center for Health Services
  • OSU-Institute of Technology
  • OSU-Oklahoma City
  • Connors State College
  • Langston University
  • Panhandle State University
  • Northeastern Oklahoma A & M
  • Northern Oklahoma College at Stillwater
  • Services Affected:
    Outlook for Windows Versions:
    15.0.4970.9999 and older
    16.0.4599.9999 and older
    1705 and older
    1705 and older
    Announcement Contact Information: