When Windows is on 90+ percent of laptops and desktops, yes, it does still matter.
When Macs still have about 5% of the PC OS market, and Linux is still around 1+ percent, YES, Microsoft still matters a lot.
The world still has abut 1 1/2 of PCs running with several versions of Windows in them, so, YES!, Microsoft still matters a lot. In fact, MS is still the leading OS and software company in the world.