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Can't add user "service" in SBS2011

After the installation I went to the SBS Console to add new users. This goes good execpt for the new user "service". When i add this user from the SBS Console and fill in the userinfo and click on add, the following message appears:

"The User Account cannot be added. Ensure that the Active Directory Domain Services service is running."

When i try to make this user from ADUC then this message appears: " Windows cannot create the new user object because pre-Windows 2000 logon name service is already in use. Select anopther name"

I search for any user wiht the name service but didn't find it. Also a didn't change anything in the OU names.

See attachments for screenshots
1 Solution
That's by design. You can't create a user account with a SAM account name of "SERVICE", because this is a reserved account since NT4.
See "Table of reserved words" in this article:
Naming conventions in Active Directory for computers, domains, sites, and OUs
sitproAuthor Commented:
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