[millstone]

The "PC market" refers to current sales. "Installed base" is the term for the metric that includes the languishing WinXP machines.

[Mikeb85]

Ah yeah you're right. The 1% came from some guy extrapolating Samsung's sales of Chromebooks to mean the whole Chromebook market...

[scholia]

Some guy being a professional journalist who actually made some effort to analyze the numbers.

I appreciate from the downvotes above that some people prefer to believe what they want to believe ;-)