The industry moves slowly
Right. IT workers and pundits love to make wild predictions about the industry, in part because they believe it changes quickly. But for the most part it doesn't change nearly as fast as popular opinion would have it.
The reports of Microsoft's impending demise are like the predictions we've seen since, oh, the mid-1980s about the impending extinction of mainframes, or of older languages like COBOL and Fortran, or of relational databases, and so on. Big customers tend to keep older technology around for a long time, because that's the most economical move (once risk, etc is factored in) - for the business itself and/or for the primary decision-makers.
Love 'em or hate 'em, Microsoft and IBM both have large installed bases with conservative customers; their fortunes will wax and wane, but they'll be around for a good while yet.