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You need do nothing more than install and activate on your new computer.
Office for Mac does not have a de-activation feature. You are granted a certain amount of reactivations for personal use.
If you have a boxed version, the product key can be found on the inside of the DVD case.
Insert the DVD into the new computer's optical drive and follow the on-screen directions to install the software.
Alternatively you can download the Microsoft Office installer from the Microsoft website.
Enter the 25-digit product key when prompted by the software.
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