Oh wow, Exchange support! This is huge.
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pls explain?
Proper integration with MS email/calendar/contacts. It would be a huge thing for me, because my work email is through MS and I've had myriad problems using Thunderbird on my work machine. This would let me finally move away from using Microsoft's outlook webapp. I know there are some other Linux projects to work with outlook, but the ones I found are basically electron wrappers over the MS webapp.
There's a paid Thunderbird add-on named Owl which adds Exchange support (10$/year). It's not perfect but does the job.
@Tangent5280 for context: Exchange is a custom email/collaboration suite protocoll by Microsoft. Thunderbird doesn't support that. Often, it's not really a problem, because one can enable SMTP/IMAP/POP access for their O365 accounts. However an administrator has to do that, and, for instance, my university doesn't allow that.
Does Thunderbird have Gnome Online Accounts integration yet? If not I'd love that.