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VMware Zimbra Collaboration Server is an open source email and collaboration platform that includes email, contacts, calendar, documents and more. It is a Web-based application suite that can be deployed as an on-premise private cloud or outsourced public cloud service.
Zimbra Collaboration Server is compatible with desktop email clients, such as Windows Outlook, and is compatible with Windows, Apple and Linux computers. It also performs over-the-air sync to mobile device operating systems, including iOS, Android, Windows Mobile and BlackBerry.
Zimbra Collaboration Server is intended for enterprise deployment with the goal of integrating myriad collaboration tools.