Can confirm. I also have to use Sharepoint with certain groups, and it works just fine. The web interface for Outlook works just fine as well.

I also have to use Google at work, and everything I've used works within Firefox.

I think it's important to point this out because a lot of people seem to be laboring under the misconception that the sites they use will break in Firefox. The only sites I've found that don't work are things like Bing AI, which work fine if you switch the user agent header.