Update – HTC Desire HD Firmware Over The Air (FOTA) update
You can now download the latest software update for new features and improved performance. It won’t delete any of your content and we’d recommend using a Wi-Fi connection as this is a large update. If not, standard data connection charges may apply. Any questions? Contact us via www.htc.com. After installing the update, you can confirm a successful update by confirming the Software number (From the Home Screen go to MENU> Settings> About Phone> Software Information> Software number). The new Software number will be 1.32.405.3
Update Information: Screen control and photo message compatibility enhancements
Note: We still recommend you back up your all personal data first.
I have just installed it and not noticed any difference (though my phone does not suffer with the proximity sensor problem reported by some)