Avoid "cheap" keys from auction sites. These are often volume licenses meant for businesses; Microsoft frequently deactivates these, leaving you with an "Unlicensed Product" error within weeks.
If you purchased a physical or digital product key (format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX), follow these steps to redeem it: ms word 365 activation key
LibreOffice feels lighter and faster than the increasingly bloated Microsoft 365, and it gives you complete ownership of your documents without any subscription fees. It's a fantastic choice for anyone who wants a no-cost, perpetual Office alternative. Avoid "cheap" keys from auction sites