neowin[.]net/news/microsoft-to-force-install-new-outlook-on-windows-10-shares-powershellregistry-workaround/
For quite some time now the idgits at Microsoft have been trying to force the [IMHO horrible] new outlook web app as a replacement for Windows Mail on anyone using using Win11. Mail app support ended December 31st, but so far, thankfully, they haven't removed the app itself from Windows. [They have several times unpinned Mail from the TaskBar.] And so far it works the same as it has been for the last few months -- start Mail, new outlook opens, click the Settings icon [gear] on the menu bar, click general on the left, click About on the right, scroll down and click open Mail. I just leave it running for the rest of the day, minimized to the TaskBar. The Neowin article links to a Microsoft page saying that you can uninstall new outlook, though you cannot prevent it from being installed, and it shows you a PowerShell command to make that happen. If you do that in Win11 it works for the few minutes it takes for the Store to reinstall new outlook. I have no clue if that's what will happen in Win10 as well.