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Ramifications of Duplicate Machine SIDs on an AD Domain running W2K3R2

My current client has deployed about 900 Windows 2000 SP4 machines with the same SID - IE ghosted, but without running SYSPREP or NewSID afterwards.

These machines have been joined to an AD domain, which I am about to migrate (with ADMTv3) to a new AD domain as part of an infrastructure upgrade.

I can find lots of info on how to change SIDs, but nothing on the ramifications of duplicate machine SIDs on a Windows Server 2003 R2 Domain (W2K3 functional level). I've looked at the Domain SIDs and these are all unique due to the action of the RID on joining the domain - this is a problem related to the machine SID, assuming there is even a problem.
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Tony Massa
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tmassa99

Thanks for the response, this is pretty much all I was able to find out myself.
Cheers

JamesDS