I upgraded today to 2.2.1 and no issues other than I now get prompted for a PIN to unlock my screen. I upgraded from the non Froyo original shipping OS and never had this before. I go to Settings>Location & Security>Change Screen Lock to disable the PIN but the None option is grayed out and says disabled by remote phone administrator. I sync to an Exchange server and didn't know if this is my issue. I noticed the change logs for 2.2.1 update said something about enhanced Exchange support. I hate this extra process and want it removed. Anything I can do?