Windows XP doesn't support SNI, and IE uses the windows libraries for SSL (Chrome may too - not sure). Firefox uses its own (NSS) so isn't tied to the windows version. Which is the main reason why SNI use hasn't really taken off - its only in the last year that people have been able to really stop supporting ie6 (with Google being big enough to not supporting ie8, a few other sites are starting to match). Not supporting winXP on your website (which is what SNI effectively requires) is a lot further off - at best 2014 (when Microsoft stops supporting it)
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