: This option provides a "lifetime" license for a single PC. You pay once and own that specific version forever, though you only receive security updates and not new features.
: The current standard for one-time purchases, including classic desktop apps. buy office professional
: While not called "Professional" in name, the Microsoft 365 Business Standard or Premium plans provide the same "Professional" apps with added benefits like 1 TB of OneDrive cloud storage and continuous feature updates. Where can I buy Microsoft Office Professional 2021? : This option provides a "lifetime" license for a single PC