'PC acquisition/Windows tax' is similar to (and can be
replaced by) Linux "patent tax"
The earlier agreement to preinstall Windows on Founder PCs helped fight piracy by reducing the number of systems that are shipped without operating systems.
”If computers were ever to be stripped off Windows in Europe, would software patents have a new type of tax imposed?“'Piracy' helps Microsoft for the same reason IP 'theft' helps it. It gets people dependent on its software/protocols/formats/interfaces and at any time Microsoft can turn the table over and start charging money. Recall the MP3 lawsuit against Microsoft.
First they entice their prey and let it grow. It's a bait. Only later, once it has become too mature (think about Mono' infestation') and the victim highly entangled should they attack, in order to gain from maximal damages. You can hopefully see how 'Windows tax' -- that which one pays when buying a PC with unwanted preinstalled software -- can be replaced by another form of 'tax'.
Returning to the issue at hand, to China, the news is of course a big step back. In Europe, unbundling (i.e. no forced Vista installation) seems like the way to go, particularly after the EU's ruling. Articles on this matter include: