By a hard reset I presume you mean resetting to manufacturers default settings?
If you can boot your device, the easiest way is to go to Start > Settings > System Tab > Clear Storage.
If you cannot boot into Windows Mobile on your Orbit then the best way is to hold down both the left and the right soft-keys (the two keys with _ marked on them, either side of the wheel) at the same time whilst you poke a paperclip (or similar pointed item) into the reset button on the left side of the orbit. This will initiate a hard reset on the device.
Answers & Comments
By a hard reset I presume you mean resetting to manufacturers default settings?
If you can boot your device, the easiest way is to go to Start > Settings > System Tab > Clear Storage.
If you cannot boot into Windows Mobile on your Orbit then the best way is to hold down both the left and the right soft-keys (the two keys with _ marked on them, either side of the wheel) at the same time whilst you poke a paperclip (or similar pointed item) into the reset button on the left side of the orbit. This will initiate a hard reset on the device.