Server 2012 R2 as DC in existing Forest SBS 2003 PDC

just want some feedback on this.

I am installing a new server with MS 2012 R2 Server Standard, and Exchange 2013.  Thinking about adding the Server as an additional DC in an existing Forest allowing the SBS 2003 server to continue as Primary Controller.  The existing SBS 2003 is the current Exchange server.

I'm thinking I will allow users to continue to authenticate through the SBS 2003, stop Exchange on that server after migration and then add each user's Exchange back to the new Exchange 2013 server.

The obvious short term benefit is to prevent from having to reconfigure each workstation/desktop/user to a new domain/server.

thoughts?

Thanks,
frdbadfAsked:
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Cliff GaliherCommented:
Don't make an exchange server a DC. So unless you are going to stand up multiple physics or virtual servers, you can start thinking of a new plan.
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Amit KumarCommented:
yes it can work as Exchange 2013 supports Active Directory of Windows server 2003 SP2 or later. It just need Forest functional mode as 2003 only.
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Amit KumarCommented:
Agree with Cliff as well, never build Exchange  server on DC. As you will install Exchange 2013 on separate server so it is ok, but i would recommend one more thing create one ADC and move all FSMO on it. then you can play with it.

Purpose of creating ADC, at least you will have live Domain controller in case any issue occurs with existing DC. Also ADC should be on separate server, don't install Exchange on it as well.
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Leroy LuffHead of IT & DIgitalCommented:
The migration from 2003 to 2012DC and 2013 Exchange is not possible.

1st.You will need to upgrade to a 2008 DC - This upgrades the schema. This should be made primary DC.
2nd. You will need to migrate the 2003 Exchange to 2007.

From here you can upgrade to 2012DC and 2013 Exc versions. Take in mind Server 2012's Hyper V capabilities is excellent so you can create virtual machines to each have their own "major" role. Also note not to install any other roles with a Hyper V host.
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