Return
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Title
Outlook Plugins not working after migration -
Description
After Migration, Outlook plugins display the following:
ADD-IN ERROR
This add-in could not be started. Close this dialog to
ignore the problem or click "Restart to try again.
[Restart] -
Cause
Error messages such as these are often caused by render issues with the browser library chosen to do the rendering for the plugin. One such module is https://appsource.microsoft.com/en-us/product/office/WA104295828?tab=OverviewThis is detailed in Microsoft's KB article at https://docs.microsoft.com/en-us/office/dev/add-ins/concepts/browsers-used-by-office-web-add-ins -
Resolution
Per the Microsoft article referenced above users should upgrade to Windows 10 version 1903 or higher and Microsoft 365 version 16.011629 and higher.That being said, this is not always possible and may not always fix this. You may be able to circumvent this by running the following in an elevated powershell:Add-AppxPackage -register -disable c:\windows\SystemApps\Microsoft.Win32WebViewHost_cw5n1h2txyewy\AppxManifest.xmlThis will reset the webview module on Windows, which should allow all these addins to work properly again.