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Please be informed that Microsoft Office does not come as subscription program. However, computers manufactures Office trial version with computers which will expire within a period of time. Your office version might came installed with the computer.
In this case, after expiring the trial version, you have to renew it or purchase a new version from Microsoft in order to use Office further. The serial numbers came with your computer is for Windows and not for Microsoft office.
I would suggest you either purchase a new version of Microsoft Office, or install an alternative like Open Office,.
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