Adding 2008 R2 Domain controller to exsiting Small Business Server 2008 Domain

I have a Small Business Server 2008 domain, and wish to add an additional domain controller at a branch office.  I currently have Server 2008 R2 STD installed at the branch office with a Site to Site VPN connection, but have not been able to find any info except I will have to run AD Prep on the SBS 2008 server, and dcpromo on the R2 server in order for it to become a domain controller.  Has anyone done this to a SBS 2008 server yet? I'm just very cautious because I cannot afford to have much down time.

Thanks In advance!
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Rob WilliamsCommented:
This may be helpful as well:
Implementing a Second Server on Your Windows Small Business Server 2008 Network
Rob WilliamsCommented:
-run add prep from the R2 CD on the SBS
-create a computer account for the new server in server management under "manage server computers"
-on the remote server make sure it points ONLY to the SBS for DNS
-join it t the domain using the standard  http://connect
-run DCpromo on tthe new server
-install DNS
-on the SBS under AD sites and services add the remote subnet (which must be different by the way. I assume it is if your VPN is working), and add the remote site/server
-on the new DC make it a global catalog server

More information:
Add and Manage Additional Servers in a Windows Small Business Server Domain
Rob WilliamsCommented:
angelIII I can't see how the question above could have been better answered that in my posts. The process is outlined step by step and includes links for further information if needed. My suggestion would be to award points to http:#26147373
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