July 9, 2019 — KB4507457 (Security-only update)
This security update includes quality improvements. Key changes include:
- Security updates to Windows Wireless Networking, Windows Server, Windows Storage and Filesystems, Microsoft Graphics Component, Windows Input and Composition, Windows Kernel, and Windows App Platform and Frameworks.

July 9, 2019 — KB4507448 (Monthly Rollup)
This security update includes improvements and fixes that were a part of update KB4503283 (released June 20, 2019) and addresses the following issues:
- Addresses an issue that may cause BitLocker to go into recovery mode if BitLocker is being provisioned at the same time as updates are being installed.
- Security updates to Windows Wireless Networking, Windows Server, Windows Storage and Filesystems, Microsoft Graphics Component, Windows Input and Composition, Windows Kernel, and Windows App Platform and Frameworks.

June 20, 2019 — KB4503283 (Preview of Monthly Rollup)
This non-security update includes improvements and fixes that were a part of KB4503276 (released June 11, 2019) and also includes these new quality improvements as a preview of the next Monthly Rollup update:
- Addresses an issue that prevents the Calculator application from following the Gannen setting when it is enabled. For more information, see KB4469068.
- Addresses an issue with evaluating the compatibility status of the Windows ecosystem to help ensure application and device compatibility for all updates to Windows.
- Addresses an issue that may cause the UI to stop responding for several seconds when scrolling in windows that have many child windows.
- Addresses a reliability issue in Windows.
- Addresses an issue that causes Internet Explorer 11 to stop working when it opens or interacts with Scalable Vector Graphics (SVG) markers, including Power BI line charts with markers.
- Addresses an issue that may display the error, “MMC has detected an error in a snap-in and will unload it.” when you try to expand, view, or create Custom Views in Event Viewer. Additionally, the application may stop responding or close. You may also receive the same error when using Filter Current Log in the Action menu with built-in views or logs.

About Microsoft Windows 8.1. Microsoft Windows 8.1 is an operating system (OS) for personal computers and tablet computers.

Windows 8.1 runs on touchscreen devices as well as traditional computers that rely on a mouse and keyboard. Microsoft designed Windows 8.1 to address widespread complaints about Windows 8. Most notably, Windows 8.1 reinstated the Start button, a familiar navigational feature of previous OS versions. Microsoft also made it easier to open, close and multitask among several apps using a mouse.

Windows 8.1 introduced the Open MDM application programming interface, which allows IT administrators to control and secure devices using third-party mobile device management (MDM) software. The OS also integrated OneDrive (formerly SkyDrive), Microsoft's cloud storage and file-sharing service, with its file system.

Windows 8.1 can run on devices with at least 1 GB of RAM and 16 GB of flash storage – a lower bar than Windows 8, which required 2 GB of RAM and 32 GB of flash storage.

Product: Microsoft Windows
Version: 8.1 (build 9600.19401) *
Supported Architectures: 32bit / 64bit
Website Home Page : www.microsoft.com
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