We need our serial number for Acrobat XI. Our systems were updated, and our serial number was removed. We need the serial number again so we stop getting the pop-up throughout the office.
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You can lookup your serial number (if you registered your copy) on your Adobe account page: Adobe ID
If that does not work, you will have to contact Adobe Support: http://helpx.adobe.com/contact.html (don't use any of the "Forum" options, otherwise you will end up here again)
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