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For a long time, I've had trouble understanding how group nesting is supposed to work in a multi-forest AD environment. It seems like there are arbitrary limitations placed on group types, with regards to what groups they can contain. For instance, speaks about some of these complexities.

Does anyone know why these limitations exist?

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closed as not constructive by Greg Askew, MDMarra, Scott Pack, mdpc, Ward Jan 8 '13 at 3:05

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Because having every group existing in the global catalog would vastly increase its size, so only Universal groups are in the GC.

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