Older Office versions not supported for connecting to Microsoft 365 services

  • Thursday, 26th January, 2023
  • 11:36am

Many customers still using older versions of Outlook have been impacted after Microsoft's decision to depreciate Basic Authentication on Microsoft 365 Exchange Online services. This was permanent and cannot be reactivated. In order to continue using Microsoft 365, your software must support Modern Authentication method. 

Keeping in mind, Microsoft has published on this article, "Office versions and connectivity to Microsoft 365 services" that the supported versions are (as of this writing); 

  • Microsoft 365 Apps - supported as long as you're using a supported version
  • Office LTSC 2021 - up-to October 2026
  • Office 2019 - up-to October 2023
  • Office 2016 - up-to October 2023 (exception)

This means that Office 2016 (exception) will only work up to October 2023 before needing to be upgraded further.

We advise all customers who must use Outlook to plan their upgrades in advance, and preferably where possible to switch to subscription that includes Office software. 

In the meantime, we are looking for alternatives and shall advise/recommend if anything comes along. 

As always, we hope you find this useful. If you need any further information or have a specific challenge - please feel free to reach out to us and one of our customer champions will be happy to assist you.

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