Microsoft is phasing out the Microsoft Store installation type for its Office applications in favor of the Click-to-Run model. New feature updates for Microsoft 365 apps via the Store will cease in October 2025, and security updates for this installation type will end in December 2026. Users are encouraged to migrate to Click-to-Run to maintain access to new features and security enhancements. Microsoft 365 applications can be installed through two methods: the Microsoft Store, which uses the Appx packaging format, and Click-to-Run, which employs a proprietary streaming .exe installer. Click-to-Run offers a virtualized application environment and is optimized for cloud-based management, particularly for enterprise customers. The transition to Click-to-Run reflects Microsoft's focus on enterprise solutions, emphasizing speed, scalability, and administrative control. Users can check their installation type by opening a Microsoft 365 application and navigating to File > Account. Upgrading from the Microsoft Store to Click-to-Run involves downloading the Office Deployment Tool, which removes the Store version and reinstalls Office using Click-to-Run. Regular users will see newer features without needing a new license, while IT administrators will benefit from streamlined deployment and enhanced control over updates and policies.