Thanks Les,

I toyed with placing the computer account within a group and then evaluating whether they were a member of the said group, but this means manual intervention to ensure that the computer account is placed either within the OU (as per your suggestion) or within a security/distribution group, atleast if it is scripted it's all automatic, so no need to worry about having to remember to place specific computers within a OU or group.
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It takes a human hours to fcuk up what a computer can do in seconds...