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MC588Z/A is the U.S. product identifier to request when you call the Apple Online Store phone number directly to be able to get Mac OS X 10.6 Server.
You can't purchase it online from Apple. You may find it at other third party stores as well.
10.6 Server can be very handy for those who need a version of Mac OS X with Rosetta to function on newer Macs with newer operating systems, as this tip explains: