domain logon not the same as actual domain

I have a situation I've not seen before. I've just inherited a network to support that has had some wierd problems over the last year and trying to get familiar with the environment.
lets say the internal domain name is mynetwork.local and all the full computer names have this in their full name. For example Server1.mynetwork.local and a workstation has a computer name of workstation1.mynetwork.local

All the logons use a different local domain for example mn\user1 instead of mynetwork\user1 and everyone is able to logon without errors.

There is a server 2008 DC
there also is a server 2003 for APPS and Citrix server
and there is also another server 2003 for BES and Backup Exec

Can someone please explain this?
Could this be a valid setup?
Terrymac_Computer_GuyAsked:
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Joseph DalyConnect With a Mentor Commented:
You could be looking at the difference between their DNS domain name and NETBIOS domain name. In the environment that I am in right now the domain name is companyname.com but the netbios domain name is the abbreviation of the company name.

If you look in the drop down box for domain selection you see the netbios name
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arnoldCommented:
It could be a domain trust. mn is one domain and mynetwork is another.
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chippedCommented:
Yep your seeing the NetBIOS name haha.
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Terrymac_Computer_GuyAuthor Commented:
This is what I've found
The main server is a SBS 2008 (server 2008) holding all 5 fsmo roles
the active directory domains and trusts show no trusts
but in the General tab the Domain name (pre-Winodws 2000) shows the abreviated name
also the domain function level is Windows 2003 as is the Forest function level
This also shows in one of the server 2003 acting as a DC

So NetbIOS it is?
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Terrymac_Computer_GuyAuthor Commented:
Shouldn't i be able to logon with mynetwork\user1 name as well as mn\user1 ? It doesn't work with the full domain name at least with RDP.
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Terrymac_Computer_GuyAuthor Commented:
I get a user name or password is incorrect.
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Joseph DalyCommented:
If you want to log on using domain\username it will be the netbios domain name you need to use.

If you are logging on as username@domainname.something then you would use full domain name not netbios.

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Joseph DalyCommented:
If you want to log on using domain\username it will be the netbios domain name you need to use.

If you are logging on as username@domainname.something then you would use full domain name not netbios.

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