@IT - Odd User Bug in Windows 7?

Here's something odd I found in a Windows Environment.   Create a new user, any user, call it @IT for username.  Don't put a password or if you really want to, go ahead and do.  Once you setup account and reboot system pc, try to login, user will not accept the password you created or even if you did not add one.  We replicated this on several as a test and it seems to happen on any system.   I wonder why that user @IT or maybe its @anything causes it to lock.

We ended up doing a password recovery on it and it even after reset of password or blanking password, still no access.  

ODD Right?.....    

-> luckily we used a windows PE to create a different account instead.. but just curious if anyone has seen this or experiences with this at all
ANWSOLAsked:
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ANWSOLAuthor Commented:
PS Local Account , Not AD account
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Neil RussellTechnical Development LeadCommented:
Local or not. Using @ in a user name is not supported.
The @defines the separation between name part and the domain part of a users full login
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ANWSOLAuthor Commented:
Thank you for your input on this!!
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