Learn how to disable hardware acceleration in Thunderbird in order to possibly resolve rendering issues/responsiveness.
Learn how to connect Thunderbird to Office 365, once you have enabled 2FA in office 365.
Learn how to use different profiles in Thunderbird. This allows you to easily separate your "work" email accounts from your "personal" email account etc.
Fix graphics appearing in the subject line in Thunderbird
Remove stored passwords from Thunderbird.