Kerio Technologies today announced a technology preview of Kerio MailServer 6.1, which will offer additional features for Mac OS X, including iCal support, enhanced Kerio WebMail for PDAs and small display devices and improvements to its collaboration tools in Entourage and MS Outlook. In addition, Kerio MailServer 6.1 will allow iCal users to subscribe to events in the Kerio MailServer, provide faster page loads in WebMail, as well as Free/Busy scheduling and Rich Text editing when composing messages. Kerio MailServer 6.1 will be available at the end of January.