Microsoft Outlook Compatibility Issue when using preview version of the next major release of Microsoft® Outlook.

  • Article Type:
  • Documentation
  • Last Modified:
  • 10/02/2023


Customers who are using a preview version of the next major release of Microsoft® Outlook.
The COM-based office plug-ins are no longer compatible.


  • CCH ProSystem fx® Tax
  • CCH ProSystem fx® Engagement
  • CCH Axcess™ Document
  • CCH Axcess™ Tax.


Currently, the preview version can revert to the classic version of Outlook. Doing so will allow the plug-ins to work as expected. It is unknown if this will be available in the final version released by Microsoft.

Microsoft has indicated on their website that they will no longer support COM add-ins with this new version of Outlook. Please click here  for more detailed information.

CCH will need to redesign and re-develop new plug-ins for Microsoft Office. That work will begin in 2024, however, release dates have not yet been determined. Until we can provide updated versions of the Office Plug-ins that are supported by the new Outlook, we recommend that firms do not install this latest version of Microsoft Outlook.

Additional Information


  Solution Tools
 Solution Id 000268651/Microsoft-Outlook-Compatibility-Issue-when-using-preview-version-of-the-next-major-release-of-Microsoft-Outlook
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