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Browser: IE5.5
i've taken a look at the headers they seem ok

May i suggest that you add max_age=0 in:

header ("Cache-Control: no-cache, must-revalidate, max_age=0");

and also i think what could create some trouble is :

header('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT');

in case there are some issues with server vs client time or the server time is not set correctly

but i'm not an expert at headers and browser caching behaviour )

Thanks for the replies