HTC Xda orbit 2 - Manual (Page 128)

128 Working With Company E-mails and Meeting Appointments
You need to perform a full synchronization between your device and the
Exchange Server first before Direct Push can be enabled.
Requirement The Direct Push feature works for your device only if your company
is using Microsoft Exchange Server 2003 Service Pack 2 (SP2)
with Exchange ActiveSync or higher version.
To enable Direct Push via Comm Manager
1. Tap Start > Programs > Comm Manager.
2. On the Comm Manager screen, tap the DirectPush button to enable
or disable DirectPush.
When enabled, the ON indicator is activated, which indicates that
you will receive e-mails as they arrive. When disabled, you need to
manually retrieve your e-mails.
To enable Direct Push via ActiveSync
1. In ActiveSync on your device, tap Menu > Schedule.
2. Select As items arrive in the Peak times and Off-peak times boxes.
Note When both the GPRS and Wi-Fi connections are turned on at the same
time, the Direct Push feature will always opt for Wi-Fi.