Windows 7 Ultimate is available for anyone to buy, whereas Windows 7 Enterprise is only available to business customers who have signed up to a qualifying Microsoft licensing scheme. If you have two Windows 7 PCs in front of you, one running Ultimate and one running Enterprise, the only way you’ll be able to tell the difference is by launching the System screen, where it details which version you’re running. Except, not quite: because Windows 7 Ultimate and Windows 7 Enterprise are essentially identical. As the name suggests, Windows 7 Ultimate contains every new enhancement from Home Premium and Professional, along with plenty of additions that only appear in this edition of the OS.