Hi All :
Long time no see.
This blog post will to show you how to upgrading or migration your AD environment from old version (at least Windows Server 2003) to newest version in a intra-forest.
This document will complete a migration of a Windows Server 2008 R2 domain to Windows Server 2012 R2 with no downtime to clients. All roles currently held including FSMO, DHCP and DNS will be transferred to enable the Windows Server 2008 R2 domain controller to be retired.
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