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encyclo - 4:39 pm on Feb 1, 2006 (gmt 0)
If it is released soon, maybe 10% to 15%. I doubt it will ever be a forced update for XP. So significant but not dominant. About five years, with a bit of luck.
The following is little more than a wild guess, but: What will be a realistic share of the browser market IE7 can get in 2006? How long will it take until IE6 usage drops below 10%?