Exchange 2010 in a SBS 2003 Environment

Our small business is currently running sbs2003.  The "higher-ups" have decided they want the newest exchange server and they don't want it to run on the same box as our existing sbs server.  I know there are other options for email that would be cheaper, but this is what I've been given.  My question is, can I install a Windows Server 2008 R2 Standard edition into an sbs 2003 active-directory?  We have a small company and it would not be a lot of work to create a new AD domain and add the users for the new exchange server.  I'm wondering what's the best, separate AD domain or same AD domain and would like opinions on what I'm looking at.

Thanks!
tparrettAsked:
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TechnicallyMaybeConnect With a Mentor Commented:
Actually the Exchange server does not have to be a domain controller and actually it is highly recommended it to NOT be a domain controller.  Exchange 2010 does not require a 2008 domain controller.
You will have no issues installing 2008 R2 standard, joining to domain, and installing Exchange 2010.
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TechnicallyMaybeConnect With a Mentor Commented:
You can easily add a 2008 R2 server into your network.  Just join it to the domain like any other server.
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tparrettAuthor Commented:
Thanks for the quick reply - I thought this would be possible, but as I've been testing this with a couple of spare boxes I'm having problems putting the 2008 R2 box into the directory and making it a domain controller.  I understand that the exchange box must also be a domain controller, but I might be showing my ignorance.

Thanks
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TechnicallyMaybeConnect With a Mentor Commented:
Also I should mention that if in the future you want to add a 2008 DC, you do have to extend the schema to make this possible.
http://thelazyadmin.com/blogs/thelazyadmin/archive/2008/07/21/extending-you-ad-schema-for-vista-and-windows-2008.aspx
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