: Reviewers on sites like Reddit and eBay report mixed results. While some "lifetime" keys from third-party sellers work for one-time activations, others are frequently flagged as "invalid" or "not genuine".
A product key is a used to activate the software and verify its authenticity. It typically follows this format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX . How to Find Your Lost Product Key microsoft office 2013 product key