English translation: Mitarbeiter-Tage=employee-days
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It seems in English both can be used synonimously:
PDF] A Buyers Guide to Spam Filtering
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... a company with 500 workers would lose 166 employee days 1 every year dealing with spam. A company with 500 employees could be losing 166 man days per year Spam ... www.blackspider.com/buyersguide - Similar pages