I have a user who has been experiencing problem with an active directory user account keep locking out for the past several weeks. When the user tries to log on in the morning, he encounter an error message reading “Referenced account is currently locked out and may not be logged onto” after putting in the username and password for the first time. When the helpdesk unlock the account the user is able to get on for a while and the problem seems temporarily fixed. But after about an hour or so, email and internet will prompt the user for a password and basically locked out of the account even though the user is logged into it. This issue happens several times per day. The account looks fine in AD. Any ideas why this might be happening?