Share price by itself doesn't mean anything.
Google market cap: $540B
Apple market cap: $580B
MSFT market cap: $470B
MSFT up 50% in the past year, catching up with Google and Apple, so Nadella sees no reason to change their path.
Since when is Defender a superior product? Isn't it the basically the same as Security Essentials, which had initially gotten good reviews in its first few years, but subsequently rated the worst at detection among all the antivirus products?
Such as "Dwyane" instead of "Dwayne", and "Antawn" instead of "Antoine". Strangely they aren't pronounced the way they are spelled. Maybe not so strange - probably indicates the literacy level of their parents.