Is a Windows Virtual Private Server highly scalable?

Yes. Scalability is one of the great advantages of a VPS. Your Windows VPS can be straightforwardly scaled, quickly and effectively. This allows for fine-grained control over both your hardware, and your operating cost. If you find, for example, that you have fewer users for one month, you can correspondingly decrease the resources you pay for. If, in another month, you experience a rapid rise in website patronage, you can rapidly scale your resources upwards to cope with the increased demand.