Add on features

==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu Linux 12.4
- Related log if you're reporting an issue:
====

hi,

im looking for a solution to configure calender, chat,task, etc to my iredmail server. is there any add on features or third party application avail for this ?

please help me with a solution.

thanks