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Outlook & Office

Change your Office 2016 product key    

This is an excellent article by Microsoft in how to do this. I recommend the cmd line solution. I have used it successfully multiple times.

https://support.office.com/en-gb/article/change-your-office-product-key-d78cf8f7-239e-4649-b726-3a8d2ceb8c81#ID0EABAAA=Use_a_command-line_script