Category:Zimbra

The Zimbra Collaboration Server (ZCS) is an email/groupware application that comes in both FOSS and paid for (Network Edition (NE)) offerings.

The FOSS version lacks some of the premium features (as you'd expect), such as mobile device sync (IMAP is available), online backup, Outlook Connector. However it also has big user community meaning that you can get some of these features, you just have to do a bit more leg-work.

Zimbra was purchased by VMware in 2011, and it was and remains to be quite common to install in a virtual machine. There is also an Appliance version, but to honest, that project seems to be lost in the wilderness, v7 has been in general release FOSS/NE since July 2011, whereas the appliance has been in Beta for years, and nobody at Zimbra/VMware will say what's going on. I tried it, got fed up, and went back to the trusty FOSS version.