I kind of hate Thunderbird because it is in every way worse than beloved Apple Mail.app, except for one: it can do the Microsoft 365 IMAP Oauth2 dance, but Mail.app can't.
Mail.app's native Exchange functionality has broken for me before and caused me to lose mail so I will not trust it. I thought I had the right solution with an IMAP connection to O365 Exchange until they forced that to use Oauth2.
Mail.app's native Exchange functionality has broken for me before and caused me to lose mail so I will not trust it. I thought I had the right solution with an IMAP connection to O365 Exchange until they forced that to use Oauth2.