To upgrade server to server 2012 R2, it requires windows server 2003 and higher DC

Insert OS installation disc and go to folder source\ADPrep\ADPrep.exe

Run ADPrep /ForestPrep in forest and

ADPrep /DomainPrep on each domain

Once complete,┬árun command RepAdmin /SyncAll /APeD – (force a sync to all the document controllers in domain) wait few minutes until domain syncs.

 

Ref: ITFreeTraining

 

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