In Win XP if you go to Control Panel/Appearances & Themes/Display/Settings/Advanced tab. you can change the font size there and it does work not just on Microsoft but on some other sites as well. You have to re-start for the changes to take effect.
one can also go to tool internet options accessibility and place a tick in ignore font sizes specified on web pages then by holding ctrl and scrolling with ones wheel on mouse font size can be varied at will.
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