We really have a plan...really
After 5 years of losing marketshare and floundering around with products nobody loves, this new mission statement will somehow fix everything. As a software developer, it's really hard to care about their Windows everywhere mission right now. If it succeeds, it probably won't matter for another 18-24 months because the uptake will be slow (especially mobile). During that time, their competitors will leapfrog ahead again.
Let's see if Nadella can really break away from the personality-driven organization of the last few years and actually create a customer-driven company that creates products people care about.