Microsoft has the corporate desktop, but it's ripe for the taking. Google and various startups are trying to get their foot in the door. Big corporations don't do anything fast and no one expects windows to be wiped out. There are still mainframes out there running ancient software. In some cases simple terminal emulator front ends still outperform newer, browser-based alternatives.

And microsoft will still probably come out with new useful and popular products, but they won't be the sort that cause shockwaves throughout the whole industry (well maybe the Game Industry but that wasn't the point).