Zimbra is an open source package, is a group of software developed by Zimbra, Inc. Zimbra is also known as Zimbra Collaboration Suite (ZCS). Zimbra software released as a commercial edition includes technical support, but the open source package doesn’t have the technical support feature. ZCS consists of client interface and a server software that together provides e-mail, managing documents, project management, social media tools, workspaces, etc.
The data synchronization is also possible by Zimbra with the mobile devices like Android, Windows, iPhone, etc. Zimbra is also capable of being together with email clients like Windows Outlook and Thunderbird, also it is supported with Linux, Apple & Windows operating systems.

Advantages of Zimbra
1) Low cost compared to other email collaboration services.
2) Provides browser-based AJAX interface for clients.
3) Compatible with Windows Outlook & Thunderbird.
5) Provides Mobile access for every platform.
4) High security with robust spam and virus protection.
6) Data synchronization is possible.
7) Provides Email backup and Restore.
Package Information
Link: https://www.dianahost.com/business-email/