What convinces you that your timing is right this time? Give me an analysis, any analysis, that shows what you're thinking. Convince me.
At some future time, you've got to be right and it's time to short. When? In a few months, next year, three years from now? MSFT will become a good short at some future point. But a few zigzag lines, drawn arbitrarily without explanation, don't sell your case. Explain!