Problem with short domain NETBIOS name

Hello,

The full domain name that we use is fulldomain.local.  The short NETBIOS name is domain.

When users login anywhere, they use domain/username.  This creates a problem with SharePoint.  When it synchronizes with AD, it creates profile fulldomain/username instead of domain/username.

I receive the error 6801 in Event Log:

The extensible extension returned an unsupported error.
 The stack trace is:"System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Microsoft.Office.Server.UserProfiles.UserProfileException: Exception while trying to migrate account 'DOMAIN\username' to 'FULLDOMAIN\username'. ---> Microsoft.SharePoint.SPException: The user does not exist or is not unique. ---> System.Runtime.InteropServices.COMException: The user does not exist or is not unique.
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In addition, when I try to create My Site, I see the 5187 error:

My Site creation failure for user 'DOMAIN\username' for site url 'http://spserver/my/personal/username'. The exception was: Microsoft.Office.Server.UserProfiles.PersonalSiteNamingConflictException: Username conflicts with another user..

What can I do?

Any ideas?

Thank you.

Thank you. Eric.