Once an Office installation has been activated with a particular key, it remains activated with that key. The only way to use a different key is to upgrade/downgrade to either a different edition of your current version (e.g. from 'Home & Student' to 'Professional' or vice-versa) or to another version (e.g. from 2013 to 2016).
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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