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If you purchased your copy of Microsoft Office from a retailer – whether an online merchant or brick and mortar vendor – your Certificate of Authenticity will be attached to the top of the package your CD came in. The product name should be clearly printed on this label, and there will be a see-through “Port-Hole™” showing noticeable paper fibers. There is also a metallic thread, similar to what you would find inside a newer American dollar bill, woven across this “Port-Hole™.” If you carefully tear the edge of the Certificate of Authenticity near this thread, you can check for legitimacy by determining that this thread is really woven in and not simply imprinted.