[RockRobotRock]

In my opinion, E2EE comes with too many compromises to be worth it for most people and/or companies. Proton wasn't evolving quickly enough, so I switched to Fastmail.

Email aside, no CardDav/CalDav is a dealbreaker for me.

[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.