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set the intial <body> font size in percent!
If it is presently set to 1em (or has no setting because it's relying on the user default) then set it to 100% (if it's 0.8em then change it to 80% etc..)
you shouldn't then need to change anything else, IE will cope should cope with resizing the rest of the em's just fine
If AOL uses IE, then this should correct the problem for your AOL users too?