I’m fairly sure Microsoft is actively trying to screw Firefox. Outlook has always sucked in Firefox, teams is a shit show. When you use a useragent switcher somehow a lot of features seem to work magically in Firefox (which tells me MS is doing this on purpose).

For Outlook (exchange) I use Thunderbird with a paid plug-in (to make the 2FA stuff work). It’s pretty cheap and totally worth it for me at least.

This is just the lastest thing, it used to be the old IT guys and the ones with a beard, long hair and a metal shirt.