After the introduction of the AKU 2 release of Windows Mobile 5, you would have probably noticed a really annoying problem. In previous versions, whenever you left your device on with external power (With power properties set not to turn off the device), the password time out period was disabled. Thus, you could have the device nicely docked in your car, drive along happily, and rest assured that the device wouldn't start prompting your for your password as you operated a 2 ton piece of metal propelled down the highway. Or you could have your device act as an alarm clock and not have to key in your PIN number just to turn the dang thing off in the morning. Life was good.

All that changed with the AKU 2 release. Now if the device was powered on, but received no input within a set amount of time, BANG - password screen. Effectively annoying GPS users around the world, and promoting lax security habits (many simply stopped using a PIN number - not a good idea!).

Sollution: Change the Registry keys:
      HKEY_LOCAL_MACHINE\Comm\Security\LASSD\AE\{50C13377-C66D-400C-889E-C316FC4AB374}
      - The value called AEFrequencyType will be 1. Change it to 2.

Note:
If you open the "Lock" applet in Control Panel to adjust anything (i.e. set a new password, change the time-out), the device will change that 2 back to a 1, making it necessary to change it back one again. This can be annoying, but not nearly as annoying as having to key the password in while driving. It should also be noted that if you have an administrator that has set password policies on your device, you're out of luck - the next time they update your 2 will be overwritten by a 1. So you need to change it again!