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I'm afraid XP won't be ignorable for another 3 or 4 years at least.

According to: http://gs.statcounter.com/#os-ww-monthly-201101-201201 XP dropped 14% in the last year, and is now on 34%. So a really dumb calculation says about 2 and a half years if that keeps up, but I guess there will be a longer tail of die-hard users... hard to tell, since it's pretty unprecedented for a particular version of a major OS to be so popular for so long.

So I guess in 2 or 3 years not supporting XP will only cost you 50 to 100 million potential users.

Microsoft stops providing XP security patches in April 2014. Any organization that wants to use XP after that will need to pay Microsoft to maintain support. Any organization that continues to use XP without support is irresponsible.

Yea, it is called a Custom Support agreement. Costs $50,000 per quarter for first year and increases every year, BTW.

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