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Windows 8.1 Pro
Windows 8.1 Pro is intended for customers who need this specific Microsoft operating-system edition for a compatible computer, application or business environment.
What you will receive
- License and activation information for Windows 8.1 Pro
- Download and installation guidance
- Customer assistance when required
Before purchasing
Confirm that your computer meets Microsoft’s processor, memory, storage, firmware and security requirements. Back up important files before installing or changing an operating system. A clean installation may remove applications and personal data.
Installation and activation
Install the exact edition named on this page. A key for one Windows edition cannot normally activate another edition. Keep your product information and order reference private.
Important lifecycle notice
Support ended on January 10, 2023. Systems outside support may continue to operate, but may no longer receive standard security updates, fixes or technical assistance. Review the Microsoft lifecycle information before purchase.
Browse our Windows collection for other editions.
Choosing the correct Windows 8.1 edition
Before ordering the Windows 8.1 Pro key, compare the Home, Pro, Enterprise, Education and workstation editions carefully. Edition-specific keys are not normally interchangeable. Confirm the installed edition, processor architecture, device requirements and intended personal, educational or organizational use.
Digital delivery and customer assistance
This product is delivered digitally; no physical disc or box is shipped. Keep the license information and order reference private. Installation and activation guidance is available when required. Back up important files before changing editions or performing a clean installation. Windows 8.1 is outside Microsoft support, so use it only when legacy compatibility is essential.