IE9 is available for Vista too. It's not available more crucially for XP, but XP is EOL in April 2014, which is within the timeframe for 1.9.x and 2.x to remain

IE9 is available for Vista too. It's not available more crucially for XP, but XP is EOL in April 2014, which is within the timeframe for 1.9.x and 2.x to remain API compatible.