Domain Consolidation Considerations

I'm a new and the only systems administrator at a small company in Vermont.  The last systems adminstrator developed an overly complex setup here that I'm trying to simplify.  We only have 5 servers (4 in main location and 1 remote) and they set it up with 2 domains.  I want to consolidate this down to one domain.  I'm in the planning phase right now and would like some input on what things I should take into consideration to complete this simplification.  
We have Win2k3, Win2k and WinNT servers.  Domain A has the bulk of our services (Remote access, Exchange2k3, and file services)There are 4 servers in that domain with 2 being Win2k3, 1 Win2k and 1 WinNT.  I will be taking the final NT server off-line first, it doesn't serve much of a purpose only serving up our remote access which I think can easily be handled by the current file server.  Domain B has our most important server running SQL and also working as a print server and yes Domain B is comprised completely of this one very important Win2k server.  There are literally no other computer accounts in this domain.  I need to dispose of the the active directory in Domain B and then bring that server up in Domain A's directory.    
I hope I'm explaining enough here.  Like I said I'm a rookie.  Any and all inputs would be appreciated.  
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Steve McCarthy, MCSE, MCSA, MCP x8, Network+, i-Net+, A+, CIWA, CCNA, FDLE FCIC, HIPAA Security OfficerConnect With a Mentor IT Consultant, Network Engineer, Windows Network Administrator, VMware AdministratorCommented:
I think you have the right idea.  The KISS method is simplest.  Taking out the NT server and moving your remote access is highly recommended.  

Things you will need to consider.
-Users on Domain B will now need logons on Domain A
-User directories and files will need the appropriate permissions of the user accounts on Domain A, once the server joins the new domain.
-SQL and or other applications may break.  Determine what services are using accounts on DomainB's domain controller and be prepared to reconfigure them to use accounts on DomainA.
-If you are using different IP ranges on A and B, you will have to change those if they exist in the same network segment.
-You may need to reeducate users, change shortcuts or reconfigure applications to the new server in DomainA, depending how connectivity was established previously.
-Take a good, full backup of the box before you do anything.  In case of disaster, you'll want the safety net of being able to go back.

I took a 5 domain company with 7 ip schemes and put it all under 1 AD unbrella.  The single domain is much easier to manage and it worked great for me.   You'll get through it fine and gain some valuable experience in the effort.

systemsadministratorAuthor Commented:
Sorry about giving you only a B.  I guess I should have THOROUGHLY read all the guideline to this site.  Instead of giving a "B" I should have ask for some clarification or expanded on my question.  Sorry, it won't happen again.

The continuation of my question is as follows:

As of right now any workstation in the company can log on to either Domain A or B.  If I scrap Domain B and it's still an option on the login screen my users will get confused.  How do I ensure that on every workstation the option to login to Domain B is removed?  
Steve McCarthy, MCSE, MCSA, MCP x8, Network+, i-Net+, A+, CIWA, CCNA, FDLE FCIC, HIPAA Security OfficerIT Consultant, Network Engineer, Windows Network Administrator, VMware AdministratorCommented:
For all those users, drop them to a workgroup and then joing the new domain.  The old one won't show up as an option any longer.
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