If you specifically need a 2016 key for compatibility with older hardware or operating systems, you can find them through these types of vendors:
Official support for ended on October 14, 2025 . While you can still technically buy keys from third-party resellers, Microsoft no longer sells this version directly and strongly recommends upgrading to a supported version like Microsoft 365 or Office 2024 to avoid security risks. Where to Buy (at your own risk) buy microsoft office 2016 product key