QRESYNC

[CP vd Vyver]

Good day
I use ClearOS server that has cyrus-imapd-2.3.16-6.v6.4.i686 installed. 
I have installed SOGO Groupware server for calendar and Contact sharing.
It looks like 2.3.16 does not have QRESYNC active or its only available 
from version 2.4 can someone clarify this for me?

I need QRESYNC to make Activesync work correctly so I can sync the 
tablets and mobile phones. Clearos does no have 2.4 in its repos so I 
cant upgrade through them
I run a VM so I can make  backup and try to upgrade to 2.4 and see if it 
works, but if it is just a config file that needs to be edited to get 
2.3 to work that would be first class.

I can help myself with Linux but don't have a lot of experience with 
Linux mail servers so baby steps please.
Thanks

CP vd Vyver