Zimbra offers open-source e-mail, address book, calendar, tasks, and collaboration software. The company offers Zimbra Collaboration Server, which provides post-PC email, calendar, and collaboration solutions that solve the challenges faced by organizations mired in legacy communications infrastructure; and Zimbra Desktop, which aggregates information across accounts such as Zimbra, Yahoo Mail, Gmail, and Hotmail.

The company was founded in 2003 and is headquartered in Frisco, Texas with additional offices in San Mateo, California; London; Tokyo; Singapore; and Pune, India.

Founders:  Roland Schemers, Ross Dargahi, Satish Dharmaraj