There are four ̶s̶i̶x̶ ̶(s̶e̶v̶e̶n̶ five counting the web version) maintained Outlook variants on Windows 11, last I checked and I have issues with each one. Search especially, but then that has remained an unsolved problem for 30 years. I am sure "AI" will finally solve this.

Edit: Have checked and found that two I thought were still maintained (16 and 19) were EOLd in October.