[asterisk-users] Asterisk Calendar integration suggestions

[john at millican.us]

Hello all,
I am looking into building a calendar server (due to business 
requierments I can not use public hosted calender like Google), and am 
looking for suggestions based on experience with different calendar 
applications/servers available for Linux that you have integrated with 
Asterisk.  If you can give a quick, simple list of what worked and what 
didn't I would be very grateful.
Thank You,
John