Change fsmo roles then demote old server
Change fsmo roles then demote old server
http://blogs.technet.com/b/canitpro/archive/2015/02/11/step-by-step-migrating-windows-server-2003-fsmo-roles-to-windows-server-2012-r2.aspx
Then to demote the old one.
On a domain controller, click Start, and then click Run.
In Open, type dcpromo to open the Active Directory Installation Wizard, and then click Next.
On the Remove Active Directory page, click Next, and then continue to follow the wizard.
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