When buying a computer in a shopping mall, is the WIN7 Ultimate Edition installed by a salesman with a mobile hard disk genuine?

If it's from a computer supermarket, the system must be pirated.

If you buy it in a regular shopping mall and issue a formal invoice, it depends. Generally, Microsoft will give the merchant an authorization to tell you how many computers can be installed in the genuine system I gave you, assuming it is 1000. However, it doesn't matter if the merchant ignores Microsoft's agreement after obtaining authorization and installs 10000 units at one go. In addition, Microsoft will customize some systems for some companies. For example, if you install Lenovo's computer system, you will have Lenovo's own software. These are called OEM versions. These are not serial numbers, but they are also genuine.

Of course, Microsoft generally authorizes the installation of the home edition, and the business notebook is a professional edition (the computer I am using now is Dell's business notebook). WIN7 Ultimate is generally for enterprise users, and WIN7 Ultimate is undoubtedly pirated.