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by scalaris373 2801 days ago
I use Zimbra. I've been running it as a selfhosted service for 8 years now. It does need quite a powerful server (it's written in Java, so it needs lots of RAM), but it works wonderfully, and their web interface is just great!

Maintenance is quite simple, just install updated versions when they come out, I haven't had any problems with it.

Regarding mobile integration, I use Android. Any IMAP client will sync mail correctly, Zcal and Zcard for synchronizing calendar and contacts.