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Microsoft is killing Office 2021 in October to push you onto Microsoft 365, how to fight back
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
For testing I installed a perpetual version of publisher 2019 in a VM (only publisher, edited the XML setup file) and activated with massgrave. It has a banner on top that says that on October it will automatically uninstall and there will be no way to open the proprietary files anymore
I hope it's just that they didn't test the message and that it was meant only for office 365 and not all the perpetual versions