communial calendar ?caldav?

[SetToLoki]

HI,

 

I am attempting to create a communal calendar on an intranet using php.

 

the idea is to have the calendar updated from a companies mail server calendar ran by Kerio Mailserver. Kerio will export a .ics file which I can have PHP read and create the  communal calendar entries.

 

My problem is having php send the information back to the kerio mailserver and update the users calendar. Kerio has no import calendar options, applications such as google's calendar and mozzila's calendar use a protocol named CalDav (http://caldav.calconnect.org/index.html) to do this task and sync calendars. This is a little above my head I am not sure how to make PHP speak to this protocol, or even how to install the damn thing on my webserver.

 

I have been searching for a fair few hours now and still no closer to solving this problem.  I appreciate it may not strictly be a php problem but hoping someone her can point me in the right direction.