I am pretty sure this issue occurred to almost all Wintel or Service Desk Engineers - User came to us, make a report saying that his or her ID was locked, and he or she did not know why (or did they?). Nevertheless, I have compiled on how I checked and resolved this issue in my environment, hopefully it will help yours too. Issues : Troubleshooting Account Locked Troubleshooting   Download Account Lockout and Management Tools from here . Get it extracted. Launch LockoutStatus.exe Go to File | Select Target... Put in target user name, domain, and if needed alternate domain admin credential. Press OK once done. Collecting data...