Migrate from Windows 2003 Server to SBS 2003???

I have an installation of a single Windows 2003 Server (Standard) that is out of disk space.  It serves about 15 ysers. I'm upgrading the disk system, removing the existing SATA drives and replacing them with a Adaptec RAID Card and larger SATA drives configured for RAID 10.   During this change out I'm looking to deploy Exchange 2003, so I'm seriously looking to move to SBS 2003.  I'm planning on keeping the domain and server name the same.   I doubt that I can migrate active directory to the new box, can this be done?   Is there anyway that I can reuse the existing user profiles on the XP Pro client computers?
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kdubendorfAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You can install SBS into an existing domain.... it's supported, but in general, I believe the recommendation is to install a fresh domain.
http://support.microsoft.com/kb/884453

More information on SBS in general can be found here:
http://www.lwcomputing.com/tips/static/sbs.asp
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kdubendorfAuthor Commented:
The problem is we're dealing with one server here.   So once I replace the disks the server / domain controller is gone unless I restore onto the new disk array.
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kdubendorfAuthor Commented:
I'll review the article in more depth.  I see why you recommended it.   I'll be back.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Think OUTSIDE the box.  (Sort of).  Get yourself a copy of Virtual Server, Virtual PC, VMWare, and install another 2003 DC (run it off a workstation).  Then you can rebuild your existing server with SBS.  Just remember to properly transfer FSMO roles and the Global Catalog before demoting and removing the original DC prior to the rebuild.
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kdubendorfAuthor Commented:
Got the Virtual Server and Installed 2003 on it.  Are there any instructions that you would recommend for transfering the FSMO and GC?  
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kdubendorfAuthor Commented:
Attempted to transfer the FSMO and GC but had an Active Directory Conflict.    New temporary server was R2 and kept getting messages telling me that the R2 Active Directory is incompatible with the R2 Active Directory.   Next time I'll do this it should save a lot of time.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You mean a message about Schema versions?  What exactly happened?  The schema message is normal - there's a second ADPREP that must be run on the R2 Second CD.
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