Old Office Versions Can’t Connect to Microsoft 365 Services
Contents
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Issue / Fault definition
Starting with November 1st, 2021, the minimum version requirements for connecting Outlook to Office 365 and Microsoft 365 services changed.
Microsoft started rolling out the block for Outlook 2007 on November 1st. The block will affect Outlook 2010 users in the coming weeks. The safest solution is to upgrade to the latest Office version, bringing enhanced security and stability options and many new features.
Impact
- Outlook 2007
- Outlook 2010
- Office 2013 versions earlier than 15.0.4971.1000
- Office 2016 versions earlier than 16.0.4600.1000
Known / associated error messages
Known Fixes / Solutions
No known workarounds; this is a hard block from Microsoft.
Mitigation
Ensure all devices are up to date with security and vulnerability patches from Microsoft and third parties
