Is there any open source Exchange server? [closed]
Zimbra is an open source alternative to Microsoft Exchange. It uses a number of open source products, namely Postfix, Tomcat and OpenLdap. It can interact with Active Directory and other directory structures. It also offers a pretty extensive AJAX enabled web interface.
It offers most of the features offered by Exchange:
- Contacts
- Shared Calendaring
- VOIP integration
- Mobile access with activesync push sync and Blackberry Enterprise Server connector
- MAPI, IMAP, POP, iCal iSync Access
- Extensive web interface
It offers both an open source and commercial version, and is now owned by Yahoo.
Ahh...the white whale of open source, the Exchange killer. There's no shortage of competitors:
- SoGO
- Open-XChange
- Zimbra
- Citadel
- Bongo
- Horde
- Meldware
- OpenChange
- Scalix
- eGroupWare
- phpGroupWare
And, for those that aren't necessarily looking for free (in either sense), but just don't like Microsoft or Exchange:
- Gordano
- PostPath (once Cisco decides what to do with it)
- Lotus Domino/Notes
- Google Apps
- Kerio KMS
- GroupWise
There is an Exchange-like open source project called Open-Xchange.
It is a messaging and collaboration platform combining common free software packages, open standards and web services. Open-Xchange Server is available as proprietary software and as a community supported open-source software (GPL 2) package.
See this article about Zafara groupware.
We evaluated http://www.kerio.com/ when we moved away from Exchange 5.5, and it seemed quite polished.