These updates have only non-security fixes. These are validated, production-quality optional releases, primarily for commercial customers and advanced users “seeking” updates.
We also release optional updates in the third and fourth weeks of the month, respectively known as “C” and “D” releases. Pacific time to give commercial customers plenty of time to test the updates and deploy them to devices. We chose the second Tuesday at 10:00 a.m. These updates are published on the second Tuesday of each month, known as the “B” rel e a s e ( “B” refers to the second week in the month), and are the only regular monthly releases that include both new security fixes and previously released security and non-security fixes. Most users are familiar with what is commonly referred to as “Patch Tuesday” or Update Tuesday. Windows 10 quality updates are cumulative and contain all previously released fixes to guard against fragmentation of the OS that can lead to reliability and vulnerability issues when only a subset of fixes are installed. Windows monthly updates also include quality and reliability fixes based on user feedback and data we monitor, to improve the user’s overall experience. During peak times, we update over 1,000 devices per second, allowing us to deliver the latest security and quality improvements to hundreds of millions of customers that protect them from potential vulnerabilities. This includes numerous combinations of Windows versions and editions from the most current versions of Windows 10 to end-of-support versions such as Windows XP on custom support agreements. To put this into perspective, each month, we update over one billion devices ranging from desktop PCs and IoT devices to servers. To provide the best protection, our customers’ devices need updating before vulnerabilities are publicly disclosed, a complex effort that requires a high degree of cross-industry cooperation. The scale and diversity of the Windows ecosystem requires us to take a data-driven approach to quality and to leverage automation for testing, validation and distribution. That is why, today, as part of our series of blogs on the Windows approach to quality, I’ll share an overview of how we deliver these critical updates on a massive scale as a key component of our ongoing Windows as a service effort.
We strive to help you keep your Windows devices, regardless of which version of Windows they are running, up to date with the latest monthly quality updates to help mitigate the evolving threat landscape. We focus on protecting customers from these security threats by providing security updates on a timely basis and with high quality. Today’s global cybersecurity threats are both dynamic and sophisticated, and new vulnerabilities are discovered almost every day.
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