Fixed : Windows User account repeatedly locked for no reason ?

Situation 1 : Forgotten PC with an open session and Outlook running

If you leave Outlook running on a PC you forgot somewhere hidden in your office, it will go on using the same credential for ever. Even after the policy forced you to change your password, it will go on using the old credentials and ultimately lock out your account…

Situation 2 : “remember password” box checked while accessing a network share

If you check the “remember password” box when you access a network share, it will use the same password for ever. Even after the policy forced you to change your password. And then, when you’ll want to access that share again, it will use the old credentials and lock out your account.

Solution :

using command prompt fire following command

rundll32.exe keymgr.dll, KRShowKeyMgr

and remove all cached passwords one by one. Now you just need to restart.