The key regulatory changes in the U.S. come from Dodd Frank and FATCA (Foreign Account Tax Compliance Act) will require firms to upgrade their compliance function, Owen said.
As Daily Tech points out, this seems to suggest that any Vista upgrade DVD can function as a full retail copy of Vista, although it would also seem to be something that Microsoft could put the kibosh on pretty quickly, so you may not want to lose sight of that copy of your old OS just yet.