[palata]

I went from Proton to Fastmail and then Migadu. But I think that it is not really answering the question.

The question is about a Business Suite similar to the Google Suite. I don't think that Fastmail provides a Drive or Docs (as far as I know they have mail, contacts and calendar, right?).

Not to say that Proton is a perfect alternative: Proton Docs is pretty new and doesn't have the excel/powerpoint equivalents that Google has.