WIth Linux and Unix variants (Apple, Android, Ubuntu) spreading out into the desktop space Microsoft's #1 main market share tool is gone. Lock-in.
Tool #2 is to buy-up the competition and kill it (Skype for Asterisk) thereby eliminating the possibility of any alternatives disrupting the Microsoft market space. This doesn't work so well with Open Source software. But that hasn't stopped M$ from trying.
Tool #3 is to FUD,FUD,FUD the bejeezes out of the competition until a false sense of reality is created/believed. This works well with FOSS and is the tack M$ has taken with regards to FOSS but they have not succesfully killed it off yet.
Microsoft has been an empire built on what ought to be illegal business tactics and it's *FINALLY* folding in on itself. Gates will not be back, at least publicly. He won't want to be at the helm when the place finally goes under in the next 5 years.