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This was discussed all over the place.

It comes with 10.5.1 as the previous poster has already mentioned, but it has drivers for the remote-disc setup on another computer on the install disc.

Bascially it's a specific version of 10.5.1

10.5.2 is still in the 'ether' right now - but I'm sure it will come down from the heavens soon enough ;)
 
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