Hello all,
After some digging on Microsoft's site I came across this download for the Windows Mobile OS.
http://www.microsoft.com/windowsmobi...gs-update.mspx
Now I grant that this update is from August of last year but after I applied the update to my Sprint HTC Mogul my appointments for next week are the correct time (I'm on Central Time in the US). Before all my appointments were an hour ahead of what they should have been (9am instead of 10am), which is the same as what I believe everyone here is experiencing.
It says that it works for Windows Mobile 5.0, 6.0, 6.1 and 6.5, so it should work for the newer phones too. After installing the update it shows up in my Remove Programs list so you should be able to remove it if it doesn't work for your phone.
Hope this helps.