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Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
Roundcube - Web-based IMAP email client
hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.