A handful of my users (of course they are executive level) are experiencing a rather strange issue. It appears that every morning their AD accounts are getting locked out. This seems to happen around the same time every morning and the reason the user knows is that their Smartphone which recieves company emails starts asking for the username/password at which point they attempt to enter it and it either works or the account is locked and someone has to manually unlock the account.
We are running a 2008 Active Directory Domain and Exchange 2010. Looking for suggestions on how I can track down the issue that is causing these account lockouts every morning.