How many people does Microsoft employ?

Millions. Anybody who buys a computer that has Windows, uses an XBOX, or uses their services is a customer.

If you use a grocery self check out system, most of them use Windows, the store is their customer, but you are paying for the system by shopping there, so you are a customer.

If you call technical support for Windows, you are a customer.

Direct or indirect, if you use their products or services and pay for it, you are a customer.

So how many do they have? MILLIONS.