Pros:
- 100% green energy
- 100% Free Software
- Servers run on fully open POWER8 architecture!
- Server for your contacts (CalDAV), calendar (CalDav), and
notes (IMAP)
- Swiss privacy laws
- They run what seem like very fancy business-class LUG
events in Europe. Of no utility to me what-so-ever, but I'm
glad to be indirectly funding this sort of thing.
Cons:
- No 2FA :(
- Not the cheapest (but I'm happy to pay a little extra for
the above)
- Slow webmail (moved back to native clients)
I've been using Kolab Now for a year or two as well, primarily for the peace of mind of them being Swiss — who knows how far the famed "Swiss privacy" goes in reality though, especially these days. In any case, they are a Swiss entity and their servers are in Switzerland, so it's outside of the Five Eyes at least.
I'm happy with the service, though it's nothing fancy. No major downtime, other than two or three times over the years where sending a message over IMAP from Mac OS X Mail.app was rejected for an hour or so (webmail worked fine). The fact that they support open-source software development is an added benefit (and gives me a warm, fuzzy feeling inside).
