Configuring preferences and options in Outlook.com
I wrote a post on Reddit with a workaround for this problem (i.e. the 'Sync email' settings panel failing to load). You can find my post here: https://old.reddit.com/r/gsuitelegacymigration/comments/t5843t/default_from_in_microsoft_365/hz68yfx/?context=3.
I realize this might be a bit too complicated for most, apologies for that, but it's the best I could do for now. It basically boils down to Outlook.com returning a server error (HTTP status code 500) for one of the settings that used to be on the 'Sync email' settings panel, causing all of the other (mostly unrelated) settings on that panel to fail loading as well. By following the steps outlined above, we can essentially 'trick' the browser into believing that the server-side error never occurred, after which it will load all of the settings except for the one setting that was seemingly removed by Microsoft (which causes the server error). So this is basically a client-side error caused by a server-side error.
Hope this helps! :)
Brilliant solution. Thank you. Exactly what I and most of us I presume want done!
Unfortunately, as you rightfully say, a bit too complicated for a lot of us, including me.
Nonetheless, I will try following instructions and see what happens.
Maybe there is somebody out there that can write a simple macro or batch file that would be easy to implement.
Thanks once again.
Stay safe