win 7 ultimate

thought ultimate was the highest you could upgrade to ?

or did you mean upgrade to instead of upgrade from ??
 
As Steve says Ultimate is the highest version. You can upgrade to 7 Ultimate from XP, Vista and other versions of 7.

You can "downgrade" from 7 Ultimate to 7 HP and 7 Pro with a registry hack and a licence key for the relevant version.

A "pre-alpha" build of Windows 8 has leaked, but I've no idea whether it includes the ability to upgrade from 7.
 
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