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How to Solve: Outlook Version Blocked by Administrator

Recently, Microsoft Office 365 mail users encountered an issue that unable to use Outlook. When user tries to open Outlook, it will prompt out an error message box with details as below:

This error message will prompt out if user is using Outlook version as below stated:

  • Outlook 2007
  • Outlook 2010
  • Outlook 2013
  • Outlook 2016
  • Outlook for Mac 2011
  • Outlook for Mac 2016


How to Solve: Outlook Version Blocked by Administrator 1

As Microsoft explains, the minimum version requirements for connecting Outlook to Office 365 and Microsoft 365 services has changed. Older Outlook versions are not compatible with the latest security features and modern authentication protocols. The company is also working on adding support for HTTP/2 in Microsoft 365, an enhanced security protocol.

From 1st November 2021 onwards, Microsoft Office only allow below following version of Office to connect to Microsoft 365 and Office 365 services:
  • Microsoft 365 Apps for Enterprise (previously Office 365 ProPlus)
  • Microsoft 365 Apps for Business (formerly Office 365 Business)
  • Office LTSC 2021, and Office LTSC Professional Plus 2021
  • Office 2019, and Office Professional Plus 2019
  • Microsoft Office 2016, and Office Standard 2016


How to Solve: Outlook Version Blocked by Administrator 2

As to solve the issue, we will need to install the above-mentioned Microsoft Office version with minimum build version, to continue using Outlook. If user is using Outlook only and do not required for other Microsoft Office application, user may go to this URL: login.microsoftonline.com to access to your webmail.

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