ExchangePolicy Disabler
http://blogs.microsoft.co.il/blogs/t...e-devices.aspx
Or you can try this, but is specifically programmed so your device won't lock.
http://mobilitytoday.com/forum/showp...&postcount=124
Haven't tried these solutions on my HTC, but worked on my Treo. Make sure you do a soft reset after change your settings.