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Roundcube - Web-based IMAP email client
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
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.
Rainloop - RainLoop is a web based email client.
Citadel - Is a collaboration suite (messaging and groupware).