Windows account lockout troubleshooting

Here is a native tool to troubleshoot Windows accounts lock out:

http://www.microsoft.com/downloads/details.aspx?FamilyId=7AF2E69C-91F3-4E63-8629-B999ADDE0B9E&displaylang=en


You can find a DC where account was locked, as well as you can to search all Event logs from all DCs:

EventCombMT.exe. Gathers specific events from event logs of several different machines to one central location.
LockoutStatus.exe. Determines all the domain controllers that are involved in a lockout of a user in order to assist in gathering the logs.