Wasn't all that being done for Live Search too though? And that market share was way below Bing's and dropping. It's something more than just those 3 items.
Thornkin writes "A week ago there was a furor raised on Slashdot and various blogs regarding the massive drop in network throughput when one played an MP3 file on Vista. It was purported to be a big DRM conspiracy by some. It was submitted as evidence of Microsoft's incompetence by others. Today Microsoft released the details of what happened. Larry Osterman of the Windows audio team and Mark Russinovich formerly of SysInternals both posted about the issue. It turns out the network was being throttled to avoid audio glitches. The throttling was a bit too aggressive for fast networks and they are working on a fix."