Microsoft 365 (and by extension Outlook) is pretty much mandatory if you have a university or work email address. I’m super glad to see finally migrate completely over to Thunderbird myself 
List of supported and upcoming features:
Currently, the following features are supported:
Exchange email setup and folder access
Viewing, sending, replying/forwarding, moving/copying/deleting messages
Attachments (save, display, detach/delete)
Search (subject, body) and quick filtering
Microsoft 365 domains using standard OAuth2
On-premise Exchange with basic password authentication
The Thunderbird development team also plans to add support for Calendar syncing, Address book/contacts, Filter actions requiring full-message content, Microsoft 365 domains requiring custom OAuth2 app/tenant IDs, On-premise NTLM and OAuth2 authentication, and Microsoft Graph integration.
No specific timelines were provided for when these will land on Thunderbird, and implementation times may vary per item.