How to add a SBS2003 Server to an existing domain?

I have a customer who is running 1 x Windows 2003 Server Standard being used as a Terminal Server.  It is also running ADS for the domain.  They have asked me to add a SBS 2003R2 Server to the network so they can have Exchange as their mail server.  I'm not sure how to ge this done.
stewartstaceyAsked:
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Eraser63Commented:
Hi.

You can't add an SBS to an existing domain. You will have to create a new domain with the SBS and add the other server in it (domain controller or not). The other solution is to get an other Server Standard licence and a Exchange licence separately.
Sorry.
http://www.experts-exchange.com/OS/Miscellaneous/Q_20832831.html 
stewartstaceyAuthor Commented:
Ok thanks.  If I domote the Windows Server (Terminal Server)  and then add it to the SBS domain, will that affect the programs running on the Terminal Server.  i.e. will they have to be re-installed?
Eraser63Commented:
You may have to reinstall some. Just try to use them. If they bug, reinstall them.
But you will have to recreate all the users, connect all the computers in the new domain. I hope it's not a big business.

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Lee W, MVPTechnology and Business Process AdvisorCommented:
Eraser63 is mistaken - there is documentation that specifically instructs you on installing SBS into an existing domain.  HOWEVER, he is correct in the sense that you REALLY SHOULD NOT DO IT.  There can be problems and you are MUCH better advised NOT to do it.
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