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Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
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.
hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
Roundcube - Web-based IMAP email client
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
Axigen - Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.