O2 Germany has released the Windows Mobile 6 Professional upgrade for the Xda trion (HTC Hermes). The upgrade was announced back in May. Interestingly, the upgrade (as with that for the Xda orbit) is available from HTC rather than O2.
You will need your device serial number to download the upgrade.
Note: The ROM update will erase all user data and programs on your device. Be sure to backup your data before doing the update.
Source: the::unwired