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It's any browser on XP which uses the Windows Crypto API, most notably probably the second most used browser, Chrome. As long as XP is around, we're going to need One IP address per domain if we want to do SSL.

Chrome 6+ appears to support SNI on XP

[1] https://code.google.com/p/chromium/issues/detail?id=43142

[2] http://en.wikipedia.org/wiki/Server_Name_Indication#Browsers...

... and the stock Android browser, IIRC.

Fixed since 3.x: https://code.google.com/p/android/issues/detail?id=12908#c13

True, but just like XP, there are lots of pre-3.x devices out there...

That would be approximately 50% of them, btw.

I would love to...Who's with me? Anyone? Anyone? Bueller?

Alas, while I feel comfortable not XB testing WinXP because it's less than 1% of users (or whatever threshold you want), I'm not quite as comfortable using that argument with SSL certs. Unfortunately the two solutions (SNI and IPv6) are unlikely to work on XP, so the only hope is to wait until all those computers are replaced or upgraded.