There was some progress on this rebooting topic on another thread. Most Exchange servers force the phone to set the keylock when you set up the exchange account. The issue is if you set your lock password to contain ONLY numbers, then power off and on, your phone goes into the Sprint 4G welcome screen death spiral. If you set your lock password to have numbers AND letters, this doesn't happen so you can happily use Exchange Activesync to connect to your work email as it was supposed to be in Android........ unless like me, you get past the welcome screen death spiral and then your exchange calendar won't sync and you have to install touchdown anyway :-(