NEW YORK (TheStreet) – With 30% gains in the trailing 12 months, shares of software giant Microsoft have been on an impressive run. The stock, at around $45, is up 21% on the year to date, more-than doubling the tech sector's 9% gain. But investors are nervous about the company's Tuesday earnings, and not for the usual reasons. The approval rating of new CEO Satya Nadella continues to rise and it's not hard to understand why.