We have 2 users, one with a Droid2 and one with a DroidX, which require them to enter a PIN code to unlock email. All users are configured the same, PIN enforcement is *not* enabled for them or any other users in Zimbra Admin. Many other Android phones are not exhibiting this behavior. Multiple original Moto Droids, a few Droid Incredibles, an original G1, etc...
The default policy is set as:
Enable Mobile Sync - checked
Enable Mobile Policy - checked
Allow non-provisionable devices - checked
Allow partial policy enforcement on device - checked
Force pin on device - unchecked
We've not had a lot of time to experiment yet, hoping someone has some words of wisdom as to what's going on.
PS. 6.0.7 NE