SBS2008 migration to Windows Server 2012

We currently have an SBS 2008 server and we are going to upgrade it to 4 new Windows 2012 Servers. One for exchange, one Active directory/DNS/DHCP/File server, and two other file servers. What I would like to know is the best way to go about this? We can if we want get all the new servers including exchange up and running on a separate domain and network and then migrate data. I am not sure if this would be the best way though especially with Exchange and Active Directory migrating across domains?

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Lee W, MVPTechnology and Business Process AdvisorCommented:
Unless you have a good reason not to migrate with the same domain, I would preserve the existing domain and migrate your users off to new DCs and a new Exchange Server.  You can setup the new file servers and the DC right now without significant impact to most users (outside of the file transfer from one server to the others.  Then exchange becomes your biggest concern.  There's a blog on migrating from 2007 to 2013 from Microsoft, I'd suggest starting there:
Note: while SBS is a special case, for the purposes of migrating away SBS 2008 shouldn't pose many significant challenges.  The trust restriction is in place by the SBS server - once you complete the migration, you should be running essentially a standard "typical" AD structure with no artificial limits.

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AmitIT ArchitectCommented:
Moving to new domain/forest, will be bit complex. I suggest you start with DC first. Bring new DC's into environment first, two bare minimum move FSMO to new DC's. Then install other servers and perform the migration. Make sure you upgrade your client as well to latest OS, minimum win 7 with office 2010.
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