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That number must include Mac (and maybe iPhone)

Rob Oakes Updated - 30th Jun 2009

That number has to include the Mac, and might even include the
mobile version of Safari has well. Let's do a quick thought
experiment. If the usage statistics are correct, then some rough
envelop math breaks out the number of browser users as follows
(assuming a rough number of 1 billion computer users):

IE at 66% = 660 million users
Firefox at 22% = 220 million users
Safari at 8.4% = 84 million users
Chrome at 1.8% = 18 million users
Opera at 0.7% = 7 million users

Though I'm too lazy to actually do the research, the Firefox downloads
look to be pretty close to the ball parks I've heard mentioned for
number of downloads, as do the Chrome and Opera numbers. IE (like
Windows itself) is more of less omnipresent, so it passes the stupid
check.

The only number that really stands out is Safari. 84 million users
would include the entirety of the Mac user community (~35 million,
given Apple's somewhat fuzzy numbers delivered at WWDC), and an
additional 50 million Windows users. That seems far too many given
the actual number of people I've seen using Safari on Windows.
(Which, to date, is a big, fat 0.) As noted above, the only way to reach
that is by including Mac users of Safari and probably iPhone/iPod
touch as well.