Your Windows Mobile device automatically checks the server to see if new messages have arrived.
The automatic check may be set at a Scheduled Push interval or at a Direct Push setting called: “As items arrive.” With the Direct Push setting, the device essentially maintains an open connection so that information is automatically delivered (pushed) to the device as it is available.
Direct Push (As items arrive) is the default setting and requires a cellular network connection (not supported on WiFi, cradle connection, etc.)
Direct Push and Battery Life. Though a Direct Push mode offers more up-to-the-minute message delivery, for some users, increased battery consumption may be the tradeoff. If your battery is not lasting as long as you would like, try changing the setting to a Scheduled Push interval.
Mail, contacts, calendar items, and tasks sent from the device can be processed immediately, independent of the scheduled push sessions.
Change Your Synchronization Setting
1. Select Start > Programs > ActiveSync.
2. Open the ActiveSync Menu and select Schedule…
3. Select the interval at which the device should check for new items. Select an interval for Peak times and for Off-peak times:
• Manually (use the Inbox menu option: Send/Receive or the ActiveSync menu option: Sync)
• As items arrive (Requires a cellular network connection – Direct Push)
• Every 5, 10, 15, 30 or 60 minutes
• Every 2 or 4 hours
4. Mark the check box, Send outgoing items immediately. If left unmarked, outgoing items are sent from the device according to the intervals set in the synchronization schedule.