Zarafa Z-Push not pushing anything to Android

I have ClearOS Pro 6.6 and Zarafa Community Edition. Have been using this server for last 2 years or so. No complaint.
Recently wanted to take advantage of Z-Push to sync android phone. I have successfully connected Zarafa to Android 4 but i do not see any data being transfrred. Emails, Calendar, Task nothing shows up on the android.
Is it because i am using Zarafa Community?
Do i need Zarafa Small business?
If i need Zarafa business, could i install it in place of Zarafa Community without causing interruption in the email ?
Thanks!