It sounds odd enough, but push is actually client initiated. The current version of zimbra server 4.5.x will tell client that push is supported. If the client chooses to use it (and the mobile network is cooperative enough) then push will happen.
Not all phones can support push. Most WM5 phones will require patch released by carriers for push. For Treo devices only VersaMail 3.5 or above supports push. To find out whether a particular phone supports push or what patches are required, the best way is to google it. |