How to Check to See If an Office Product Key Has Been Used
If you have multiple copies of the Microsoft Office suite in your house and can't remember which product key you used with each computer, then you will have to download a third-party product key retrieval tool to find out. It's not possible to check remotely with the Microsoft activation server which keys have been activated or used, and which haven't. Run a retrieval tool on a computer with Office installed. The program will then show you which installation keys have been used.
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Instructions
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Download ProduKey Recover. Double-click the zip file, and then double-click the ProduKey application. The product key used for Office is displayed in the dialog window that appears.
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Use WinKeyFinder to locate product keys in use. Double-click the program once it has downloaded. Click "MS Office." The product key is displayed on the right of the program.
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Purchase Recover Keys, which costs about $24.95 as of March 2011. Double-click the installer to install the program. The program automatically starts after installation. Look in the dialog window for the Microsoft Office key.
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