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My company is still using Windows Server 2003 for the Domain Controllers, with DFL (and FFL) already raised to 2003 DFL/FFL.

Now, we need to trust the domain of our new subsidiary. Their domain is using Windows Server 2012 (not R2) for their DCs, with 2012 DFL/FFL.

Do we need to run adprep.exe from 2012 on our 2003 DCs to establish the trust relationship?

pepoluan
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I don't believe you do but I am basing that on the previous establishing of Trust between 2003 and 2008/R2 domains. Looking at the Checklist on Technet there is no mention of ADPrep being required.