Microsoft Office product key is a 25 character code used to activate Microsoft Office suite and check that it has not been used on more systems than Microsoft Software License Terms permit. Moreover, the user can redeem the product key only once and is not meant to be used again or can’t be shared.
The Microsoft Office product key is entered at the time of the reinstallation process to activate the software. The user will receive the product key when they purchase it from the store; the product key will be provided with the software.
All users are suggested to save the product key because it can be used in the future at the time of reinstalling the operating system. In case, somehow, any user lost the product key, they won’t reinstall the software program.