I need to replace an exchange computer that is also the domain controller

I have a computer running windows 2008 R2 Standard and Exchange 2010 that is the domain controller for a network of about 40 users. I need to replace the computer and I would like to upgrade to Windows 2012 R2. Can I add a W2012 R2 computer as another DC and make it the primary DC since the current DC is going to be phased out? Assuming that I can add the DC I plan to promote a member server running W 2012 R2 to a DC install W 2012 R2 and put Exchange 2013 on it and then take the old 2008 R2 computer out of service.
amscottnycAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
installing exchange on a domain controller is not recommended for performance reasons

since the 2008 r2 exchange server is a domain controller, you need to migrate exchange first since exchange does not support promotion/demotion events

to answer your question directly, yes you can build your 2012 r2 server, promote it, transfer your fsmo roles (and migrate dhcp if you use it), install exchange, migrate your mailboxes then remove exchange 2010 and (once everything is running well) decommission the 2008 r2 server

do recommend separate servers for these roles but understood if budgeting or other factors limit to one box
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
I would recommend you purchase a new hardware, virtualize it, add a second Exchange server, move all the roles off the 2008 server to the 2012 server and finally decommission the Exchange server.  Install a second VM to be a 2012 DC, move all the FSMO roles and then decommission the 2008 server.  You could then use that server either as bare-metal or virtualize that server also.
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