BlackBerry Has Stopped Synchronizing

If your BlackBerry stopped synchronizing do the following:

1. On the device go to Settings > Options > Advanced Options > Service Books > Scroll to Desktop [Sync].
2. Press the track wheel and select "Delete".
3. Wait 30 seconds. Press the track wheel and select "Undelete".
4. When it is done, press the Escape button, scroll down and select "Enterprise Activation". Wait 30 seconds. The device should start to reactivate without any input from the user.
5. When activation is complete test the device.