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Munster was talking about market share. I'm talking about usage share. The percentage of installed base is a more important measurement than market share - unless you are a computer salesman.

The Net Applications statistics show that Windows is losing their aggregate percentage of installed base, while the percentages of Macs and Linux are growing. It's that simple.

"The Net Applications statistics show that Windows is losing their aggregate percentage of installed base, while the percentages of Macs and Linux are growing. It's that simple."

Net Applications don't measure market share or actual sales of Macs or PC's. They don't even come close to doing that. They merely measure what OS/browser etc that people use when they visit certain sites they monitor. Their browser market share figures for example have consistently overstated Firefox figures, when compared to figures from Websidestory, which have been in that business longer.
Actual unit sales and market share for PC's are measured by IDC and Dataquest. In fact PC makers and Wall Street analysts don't even quote figures from Net Applications when talking about PC sales or market share, but they regularly quote Dataquest and IDC. Net applications is irrelevant.
IDC/Dataquest have Macs at 2.5% for December, and will probably have Mac market share down for February when the figures come out, due to PC sales rising faster than Mac sales for February.