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Server SBS 2011 migration to Server 2012r2

I want to be able to keep the current SBS 2011 server as an Exchange Server 2011 only.  The current server houses all of Active Directory.  I want to be able to keep the server "alive"  and also keep DNS role installed.  I am migrating to Server 2012r2, the old server needs to only house 2 roles Exchange 2010 and DNS if possible, as well DNS on the new server.  What is my best approach to maintain Exchange in-tact so to speak.  I can transfer the FSMO roles, but then would I demote the old server and then promote.  Please help, I am doing this migration in a week and have all all issues pre-migration done.
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KRS12
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KRS12
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You CAN'T.

SBS MUST - ABSOLUTELY MUST be the FSMO Master DC, which, in turn, means it MUST be a Domain Controller. And in turn means it SHOULD be a DNS server.

You can move your file shares.  You can add other DCs. But the SBS Server MUST be the FSMO Master DC.  Period.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
If you try to demote it with Exchange installed, you'll break Exchange.  

If you try to transfer the FSMO roles, the server will shut down after an hour or two whenever you turn it on because you will be in a License Violation state.
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