"Sir" Bill Gates? Not quite, but as close as an American can come. Microsoft Bill was given an honorary knighthood by the Queen of England at Buckingham Palace yesterday. You can't call him "Sir" because he's not British... instead he is "Knight Commander of the Most Excellent Order of the British Empire".
Seems only appropriate that the man behind the most bloated operated system in creation now also has an unnecessarily long title to go with it.
Apparently you can shorten that mess to "Bill Gates KBE"... kind of like how you can shorten the other mess to simply "Windows XP".