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Old Outlook clients to be shut off from using Microsoft 365 services on 1 November 2021


Users of Office 2007, 2010 and Early versions of 2013 should update now to avoid loss of services.

In a recent blog post, Microsoft has reminded their customers that new minimum requirements for connecting Outlook to Microsoft 365 services will change on 1 November 2021.

From November 1, 2021, users will require a minimum of Outlook 2013 Service Pack 1, including all latest fixes, to connect to Microsoft 365 services.  As a result, Outlook 2007, 2010, and Office 2013 versions earlier than 15.0.4971.1000 will no longer send or receive email when connected to 365 services.

  • Microsoft is ending basic authentication. Moving to Modern Authentication is more secure and provides Compliance and Policy controls to help manage data.
  • Microsoft timeline show the adding of support for the HTTP/2 protocol which will ensure data request are better prioritized and pushed to clients effectively.


Why should you maintain updated versions of Office applications?
  • Updated versions and security fixes will protect your systems against known vulnerabilities and over the last 5 years, application crashes in Outlook have reduced by 75%.


While it can be a challenge to stay current, as a Microsoft Partner, Digital O2 is uniquely placed to assist your organisation in upgrading your Office applications to a modern solution.