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Microsoft to force migrate Windows 11 Mail & Calendar app to Outlook PWA
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
For those wondering about their add-ins, Microsoft quote "To provide a more reliable and stable add-in experience, VSTO and COM add-ins aren't supported in the new Outlook on Windows. To ensure your add-in continues to work in the new Outlook on Windows, you must migrate your VSTO or COM add-in to an Outlook web add-in."
Looks like it might be a while until businesses move to this web based version then, as many rely on business extensions in Outlook.