Zimbra alternative

Using Bitrix24 as free Zimbra alternative

Zimbra is a collaboration suite centered around email server. It has a rather a long and tumultuous history. Founded in 2005 it was sold to Yahoo in 2007, which sold it to VMWare in 2010, which sold it to Telligent in 2013, which then decided to switch own name Telligent to Zimbra. If you are looking for a free Zimbra alternative, available both in cloud and as self hosted software, with access to source code, take a look at Bitrix24:

are already using Bitrix24