Comment Nobody mentioned OpenExchange so far... (Score 1) 207
... which IMO is excellent, Open Source, has an optional Web Interface and is Java based for relatively easy customizing. See their site.
Features of OX that I dont see in Zimbra:
- Document management & versioning
- Projects comprised of tasks
- Can be installed with remote, and various MTAs, IMAP, POP3 Servers
And there are connectors for Exchange, Lotus Notes, Evolution, etc.
