I added them just to be sure, I didn't want to run verifications across each data type to see if there are cases where more than 1 record exists for each item.
i.e. if the browser cache has more than one entry per browser (as there was more than one entry per country), then the numbers in the browser cache are also not correct. If there is only 1 browser record, 1 os record, then it wouldn't be a problem.
However, I am faily sure my Windows XP stats were way too low, so I added it to be sure.
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