Local Profiles Deleted after setting policy

We recently set a policy to delete user profiles older than 90 days. The
policy setting is Computer Configuration\Administrative Templates\System\User
Profiles -> Delete user profiles older than a specified number of days on
system restart

I came in the next day and booted my Windows Vista Enterprise workstation
and it had deleted my profile. This happened to several other users who had
Vista installed and had rebooted their workstations over the night.

Has anyone else run into this issue? We have turned off this policy, but we
would like to keep this policy enabled to clean out old profiles going
forward.

Thanks in advance.

Anybody have any ideas on this?