we are going to upgrade OS from AD 2k8 R2 to 2k12 R2 but in our environment App servers are 2003/2008 as members of the domain. which are the points check before the upgrade?
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An in-place upgrade of the existing domain controllers is not recommended. From Upgrade Domain Controllers to Windows Server 2016:
The recommended way to upgrade a domain is to promote domain controllers that run newer versions of Windows Server and demote the older domain controllers as needed. That method is preferable to upgrading the operating system of an existing domain controller.
Esa Jokinen
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