Yeah, but it's planned. They also mentioned the calendar coming in a recent blog post.

In general, I should say I am pretty happy with protonmail. I've been using it for over a year now, however, in general I'm still pretty dependent on google for calendar, android, etc.

When it comes to spam, my feeling is that I do get more now. But as long as it is properly categorized -- which it is -- I don't really mind getting it.