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How to introduce a Windows 2012 R2 server into a Windows 2008SBS environment.

realtimer asked
Last Modified: 2016-03-16

I am prepping to migrate an SBS 2008 to a Windows 2012R2 (DC/File Share/Print Services) + Windows 2012R2 (Exchange 2013).

My first phase requires me to introduce Windows 2012 R2 to the domain.  Then to make it an additional domain controller.  I have some questions.

1.I understand that once Active Directory roles have been moved to the Windows 2012 server, SBS will start complaining and will start shutting itself down.  
 At which point would it start doing this?  
 I plan on moving AD related roles AFTER Exchange 2013 is in place and all dependencies have been moved over.  
 In order to begin the Exchange 2013 process, is there anything I should or should not do when I add the Windows 2012R2 to the domain & add it as an additional domain controller?

2.I understand I will need to run adprep /forestprep and adprep/domainprep before I can promote the Windows 2012R2 server as a domain controller.  Is this correct?

Any additional gotchas or guidance would be greatly welcome.

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