I have run a sharpening service for 15 years, Now I have a problem, I sharpened
A 100 tooth mcg miter saw, It now makes a high pitch "whine" when the saw is running,
(No load) Why is it making this noise?

There is only three possible reasons:

1) air currents are differnet because of the pitch
2) a not likely reason - blade is unbalanced
3) Blade is warped

Or
Normal depending on speed blade is turning

I'm actually betting on that there is no problem. Your running it too fast.

If you have done this type of work for 15 years and do not know, I am not even going to guess. I am sure you will figure it out with your background.

Sawjerk,opps, sawman, I was not being sarcatic, I was simply saying I think you will figure this one out due to your experience.

Bad choice of words before. I got a bit angry there because of the misunderstanding.