Kerio MailServer is a commercial mail and groupware server. It runs on Windows, Linux, & Mac OS X. Administration is by a separate console application which can be run remotely. There is also a very limited web based administration facility.The Kerio MailServer product itself utilizes several open source products, including OpenSSL, SpamAssassin, PHP, and Qt.
Out of 11 users' reviews, Kerio MailServer score is:
88 / 100
Encrypted access using SSL
Anti-virus & anti-spam protection
Native over-the-air handheld synchronization
Comfortable webmail interface, connector for Microsoft Outlook and groupware features.