Change the synchronization schedule
Microsoft ActiveSync Help  

Change the synchronization schedule

When the device is connected to a wireless network and not connected directly to a PC, you can schedule wireless synchronization to occur automatically at regular intervals. Wireless synchronization is available only when synchronizing directly with Microsoft Exchange.

  1. Click Tools, then click Schedule.
  2. Set schedule settings as follows:
    To sync Do this
    When you are working or e-mail volume is high Select a shorter interval in the Peak times list.
    When e-mail volume is low Select a longer interval or As items arrive in the Off-peak times list.
    While roaming To sync automatically, tap Use above settings when device is roaming. To minimize roaming charges, clear the check box and synchronize manually while roaming.
    When you select Send in Messaging on the device Select the Send outgoing items immediately check box.

See also

Synchronize with Microsoft Exchange

Synchronize as items arrive

Change peak times