Editor: Kerio MailServer is a state- of- the- art GroupWare server allowing companies to collaborate via email, shared contacts, shared calendars and tasks. Open Source Software 1. Visit for free, full and secured software’ s. Select a product - - select a product - - Kerio API Libraries Kerio Connect Kerio Control Kerio MailServer Kerio Operator Kerio WebStar Kerio WinRoute Firewall Kerio Workspace WinRoute Lite Winroute Pro. The Kerio Mail Server is a cross platform ( Windows, Linux, and Mac OSX) mail server. Kerio MailServer is an Exchange alternative, allowing companies to collaborate via email, shared contacts, shared calendars, notes and tasks.