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Recent announcements

MessageDate
Status of September 2019 “C” release
The optional monthly “C” release for September 2019 for all supported versions of Windows and Windows Server prior to Windows 10, version 1903 and Windows Server, version 1903 will be available in the near term. For more information on the different types of monthly quality updates, see our Windows 10 update servicing cadence primer. Follow @WindowsUpdate for the latest on the availability of this release.
September 19, 2019
04:11 PM PT
Plan for change: End of service reminders for Windows 10, versions 1703 and 1803
The Enterprise and Education editions of Windows 10, version 1703 (the Creators Update) will reach end of service on October 8, 2019. The Home, Pro, Pro for Workstations, and IoT Core editions of Windows 10, version 1803 (the April 2018 Update) will reach end of service on November 12, 2019. We recommend that you update devices running these versions and editions to the latest version of Windows 10—Windows 10, version 1903—as soon as possible to help keep them protected and your environments secure.
September 13, 2019
03:23 PM PT
September 2019 security update available for all supported versions of Windows
The September 2019 security update release, referred to as our “B” release, is now available for Windows 10, version 1903 and all supported versions of Windows. We recommend that you install these updates promptly. To be informed about the latest updates and releases, follow us on Twitter @WindowsUpdate.
September 10, 2019
09:34 AM PT
Status update: Windows 10, version 1903 "D" optional release available August 30th
The August optional monthly “D” release for Windows 10, version 1903 is now available. Follow @WindowsUpdate for the latest on the availability of this release.
August 30, 2019
08:00 AM PT
Feature update install notification on Windows 10, version 1809 (the October 2018 Update)
We've had reports on August 29th that some customers running Windows 10, version 1809 (the October 2018 Update) have received notification to install the latest feature update (version 1903) early. Updating remains in your control. To install the update, you must select one of the following options: "Pick a Time", "Restart Tonight," or "Restart Now". If you are not ready to update at this time, simply dismiss the notification by clicking the arrow in the top right corner. If you have updated to Windows 10, version 1903 and would like to go back to your previous version, see the instructions here.
August 29, 2019
04:39 PM PT
Take Action: Internet Explorer 11 now available on Windows Update/WSUS for Windows Server 2012 and Windows Embedded 8 Standard
Internet Explorer 11 (KB 4492872) is now available via Windows Update (WU) and Windows Server Update Services (WSUS) for commercial customers running Windows Server 2012 and Windows Embedded 8 Standard. For details about these changes and end of support for IE10, please refer to the IT Pro blog
August 29, 2019
08:00 AM PT
Take action: SHA-2 code signing support guidance for Windows 7 SP1 and Windows Server 2008 RS2 SP1
Windows 7 SP1 and Windows Server 2008 R2 SP1 update signatures are now SHA-2 based signatures and requires that SHA-2 support to be installed. For important customer guidance on installation and troubleshooting tips, please read the knowledge base article 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.
August 23, 2019
03:35 PM PT
Take action: Windows 10, version 1703 (the Windows 10 Creators Update) reaches end of life on October 9, 2019
The Enterprise and Education editions of Windows 10, version 1703 (the Windows 10 Creators Update) will reach end of life on October 9, 2019. The Home, Pro, Pro for Workstations, and IoT Core editions reached end of service on October 8, 2018.

There is no extended support available for any edition of Windows 10, version 1703. Therefore, it will no longer be supported after October 9, 2019 and will not receive monthly security and quality updates containing protections from the latest security threats.

To continue receiving security and quality updates, Microsoft recommends that you update your devices to the latest version of Windows 10. For more information on end of service dates and currently supported versions of Windows 10, see the Windows lifecycle fact sheet.
August 23, 2019
02:17 PM PT
Resolved: Delays starting Internet Explorer 11
On August 16, 2019 at 7:16 AM a server required for downloading the Internet Explorer 11 (IE11) startup page, went down. As a result of the server outage, IE 11 became unresponsive for some customers who had not yet installed the August 2019 security updates. Customers who had the August 2019 security update installed were not affected. In order to ensure your devices remain in a serviced and secure state, we recommend you install the latest monthly update.

This issue was resolved on the server side at 1:00 pm PST. 
August 16, 2019
04:00 PM PT
August 2019 security update now available for Windows 10, version 1903 and all supported versions of Windows
The August 2019 security update release, referred to as our “B” release, is now available for Windows 10, version 1903 and all supported versions of Windows. A “B” release is the primary, regular update event for each month and is the only regular release that contains security fixes. As a result, we recommend that you install these updates promptly. For more information on the different types of monthly quality updates, see our Windows 10 update servicing cadence primer. To be informed about the latest updates and releases, follow us on Twitter @WindowsUpdate.
August 13, 2019
10:00 AM PT
Advisory: Bluetooth encryption key size vulnerability disclosed (CVE-2019-9506)
On August 13, 2019, Microsoft released security updates to address a Bluetooth key length encryption vulnerability. To exploit this vulnerability, an attacker would need specialized hardware and would be limited by the signal range of the Bluetooth devices in use. For more information about this industry-wide issue, see CVE-2019-9506 | Bluetooth Encryption Key Size Vulnerability in the Microsoft Security Update Guide and important guidance for IT pros in KB4514157. (Note: we are documenting this vulnerability together with guidance for IT admins as part of a coordinated industry disclosure effort.)
August 13, 2019
10:00 AM PT
Advisory: Windows Advanced Local Procedure Call Elevation of Privilege vulnerability disclosed (CVE-2019-1162)
On August 13, 2019, Google Project Zero (GPZ) disclosed an Elevation of Privilege (EoP) vulnerability in how Windows handles calls to Advanced Local Procedure Call (ALPC) that affects Windows operating systems, versions 8.1 and higher. An attacker must already have code execution on the target system to leverage these vulnerabilities. Microsoft released security updates on August 13, 2019 that partially address this issue. Other items disclosed by GPZ require more time to address and we are working to release a resolution in mid-September. For more information, see CVE-2019-1162 | Windows ALPC Elevation of Privilege Vulnerability
August 13, 2019
10:00 AM PT
Take action: Windows 10, version 1803 (the April 2018 Update) reaches end of service on November 12, 2019
Windows 10, version 1803 (the April 2018 Update) will reach end of service on November 12, 2019 for Home and Pro editions. We will begin updating devices running Windows 10, version 1803 to Windows 10, version 1903 (the May 2019 Update) starting July 16, 2019 to help ensure that these devices remain in a serviced and secure state. For more information, see the Windows 10, version 1903 section of the Windows release health dashboard.
August 13, 2019
10:00 AM PT
Advisory: Windows Kernel Information Disclosure Vulnerability (CVE-2019-1125)
On July 9, 2019, Microsoft released a security update for a Windows kernel information disclosure vulnerability (CVE-2019-1125). Customers who have Windows Update enabled and have applied the security updates released on July 9, 2019 are protected automatically; no further configuration is necessary. For more information, see CVE-2019-1125 | Windows Kernel Information Disclosure Vulnerability in the Microsoft Security Update Guide. (Note: we are documenting this mitigation publicly today, instead of back in July, as part of a coordinated industry disclosure effort.)
August 06, 2019
10:00 AM PT
Resolved August 1, 2019 16:00 PT: Microsoft Store users may encounter blank screens when clicking on certain buttons
Some customers running the version of the Microsoft Store app released on July 29, 2019 encountered a blank screen when selecting “Switch out of S mode,” “Get Genuine,” or some “Upgrade to [version]” OS upgrade options. This issue has now been resolved and a new version of the Microsoft Store app has been released. Users who encountered this issue will need to update the Microsoft Store app on their device. If you are still encountering an issue, please see Fix problems with apps from Microsoft Store.
August 01, 2019
02:00 PM PT
Status update: Windows 10, version 1903 “D” release now available
The optional monthly “D” release for Windows 10, version 1903 is now available. Follow @WindowsUpdate for the latest on the availability of this release.
July 26, 2019
02:00 PM PT
Plan for change: Microsoft Silverlight will reach end of support on October 12, 2021
After this date, Silverlight will not receive any future quality or security updates. Microsoft will continue to ship updates to the Silverlight 5 Developer Runtime for supported browsers and versions (Internet Explorer 10 and Internet Explorer 11); however, please note that support for Internet Explorer 10 will end on 31 January 2020. See the Silverlight end of support FAQ for more details.
July 19, 2019
12:00 AM PT
Evolving Windows 10 servicing and quality
Find out how we plan to further optimize the delivery of the next Windows 10 feature update for devices running Windows 10, version 1903. If you're a commercial customer, please see the Windows IT Pro Blog for more details on how to plan for this new update option in your environment.
July 01, 2019
02:00 PM PT
Windows 10, version 1903 starting to roll out to devices running Windows 10, version 1803 and earlier
We are now beginning to build and train the machine learning (ML) based rollout process to update devices running Windows 10, version 1803 (the April 2018 Update) and earlier versions of Windows 10, to ensure we can continue to service these devices and provide the latest updates, security updates, and improvements.
June 18, 2019
02:00 PM PT
Windows 10, version 1903 available by selecting “Check for updates”
Windows 10, version 1903 is now available for any user who manually selects “Check for updates” via Windows Update. The recommended servicing status is Semi-Annual Channel.
June 06, 2019
06:00 PM PT
Windows 10, version 1903 rollout begins
The Windows 10 May 2019 Update (Windows 10, version 1903) is available today to commercial customers via Windows Server Update Services (WSUS), Windows Update for Business, and the Volume Licensing Service Center (VLSC)—and to end users who manually select “Check for updates.” We are slowly throttling up availability while we carefully monitor data and feedback.
May 21, 2019
10:00 AM PT
What’s new in Windows Update for Business
We are enhancing and expanding the capabilities of Windows Update for Business to make the move to the cloud even easier. From simplified branch readiness options to better control over deadlines and reboots, read about the enhancements to Windows Update for Business as a part of Windows 10, version 1903.
May 21, 2019
10:00 AM PT
What’s new for businesses and IT pros in Windows 10
Explore the newest capabilities for businesses and IT in the latest feature update in the areas of intelligent security, simplified updates, flexible management, and enhanced productivity.
May 21, 2019
10:00 AM PT
Reminder: Install the latest SSU for a smoother update experience
We strongly recommend that you install the latest servicing stack update (SSU) before installing any Windows update; especially as an SSU may be a prerequisite for some updates. If you have difficulty installing Windows updates, verify that you have installed the latest SSU package for your version of Windows and then try installing the update again. Links to the latest SSU are always provided in the “How to get this update” section of each update KB article (e.g., KB4494441). For more information about SSUs, see our Servicing stack updates guidance.
May 14, 2019
10:00 AM PT
Take action: Update Remote Desktop Services on older versions of Windows
Today, we released fixes for a critical wormable, remote code execution vulnerability (CVE-2019-0708) in Remote Desktop Services—formerly known as Terminal Services. This vulnerability affects Windows 7, Windows Server 2008 R2, and earlier versions of Windows nearing end of support. It does not affect Windows 8, Windows Server 2012, or newer operating systems. While we have not observed attacks exploiting this vulnerability, affected systems should be patched with priority. Here is what you need to know:

Call to action:
  • If you are running a supported version of Windows and have automatic updates enabled, you are automatically protected and do not need to take any action.
  • If you are managing updates on behalf of your organization, you should download the latest updates from the Microsoft Security Update Guide and apply them to your Windows 7, Windows Server 2008 R2, and Windows Server 2008 devices as soon as possible.
Given the potential impact to customers and their businesses, we have also released security updates for Windows XP and Windows Server 2003, even though these operating systems have reached end of support (except by custom support agreements). While we recommend that you upgrade to the current version of Windows to benefit from the latest security protections, these updates are available from the Microsoft Update Catalog only. For more information, see KB4500705.
May 14, 2019
10:00 AM PT
Reminder: Windows 10 update servicing cadence
This month we received questions about the cadence of updates we released in April and May 2019. Here's a quick recap of our releases and servicing cadence:
  • April 9, 2019 was the regular Update Tuesday release for all versions of Windows.
  • May 1, 2019 was an \"optional,\" out of band non-security update (OOB) for Windows 10, version 1809. It was released to Microsoft Catalog and WSUS, providing a critical fix for our OEM partners.
  • May 3, 2019 was the \"optional\" Windows 10, version 1809 \"C\" release for April. This update contained important Japanese era packages for commercial customers to preview. It was released later than expected and mistakenly targeted as \"required\" (instead of \"optional\") for consumers, which pushed the update out to customers and required a reboot. Within 24 hours of receiving customer reports, we corrected the targeting logic and mitigated the issue.
For more information about the Windows 10 update servicing cadence, please see the Window IT Pro blog.
May 10, 2019
10:00 AM PT
Take action: Install servicing stack update for Windows Server 2008 SP2 for SHA-2 code sign support
A standalone update, KB4493730, that introduce SHA-2 code sign support for the servicing stack (SSU) was released today as a security update.
April 19, 2019
10:00 AM PT
The benefits of Windows 10 Dynamic Update
Dynamic Update can help organizations and end users alike ensure that their Windows 10 devices have the latest feature update content (as part of an in-place upgrade)—and preserve precious features on demand (FODs) and language packs (LPs) that may have been previously installed.

Find out which components are updated by Dynamic Update, how Dynamic Update is initiated, and how to enable or disable it.
April 17, 2019
11:26 AM PT
Improvements to the Windows 10 update experience are coming
Find out about the changes coming to the Windows update process that will improve the experience, offer users more control, and improve the quality of Windows updates.
April 04, 2019
09:00 AM PT
Take action: review your Windows Update for Business deferral values
If devices under your management are still running Windows 10 Pro or Windows 10 Pro for Workstations, version 1709, your devices will reach end of service on April 9, 2019 if you have configured both of the following Windows Update for Business policies:
  • Branch readiness is configured as Semi-Annual Channel (SAC)
  • Feature update deferral is configured as 274 days or more
In order avoid this, you need to set your feature update deferral policy to 273 days or less.
April 03, 2019
05:47 PM PT
Find a list of currently supported versions and previous releases
Every Windows product has a lifecycle. The lifecycle begins when a product is released and ends when it is no longer serviced or supported. Knowing key dates in this lifecycle helps you make informed decisions about when to update, upgrade, or make other changes to your software. Check out the updated Windows 10 release information page for a list of current versions by servicing option as well as end of service dates.
March 28, 2019
02:00 PM PT
Windows 10, version 1809 designated for broad deployment
Based on the data and the feedback we’ve received from consumers, OEMs, ISVs, partners, and commercial customers, Windows 10, version 1809 has transitioned to broad deployment. With this, the Windows 10 release information page will now reflect Semi-Annual Channel (SAC) for version 1809.
March 28, 2019
10:00 AM PT
Reminder: Additional servicing for the Windows 10 Enterprise, Education, and IoT Enterprise, version 1607 ends April 9, 2019
The additional servicing for Windows 10 Enterprise, Education, and IoT Enterprise editions ends on April 9, 2019 and doesn't extend beyond this date. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.

Devices running Windows 10 Enterprise 2016 LTSB will continue to receive updates until October 2026 per the Fixed Lifecycle Policy. Windows 10, version 1607 devices running the Intel “Clovertrail” chipset will continue to receive updates until January 2023.
March 12, 2019
10:00 AM PT
Reminder: Windows 10 Home, Pro, Pro for Workstations, and IoT Core, version 1709 will reach end of service on April 9, 2019
Windows 10, version 1709, will reach end of service on April 9, 2019 for devices running Windows 10 Home, Pro, Pro for Workstations, and IoT Core editions. These devices will no longer receive monthly security and quality updates that contain protection from the latest security threats. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.

Windows 10 Enterprise, Education, and IoT Enterprise editions will continue to receive servicing for 12 months at no cost per the lifecycle announcement on October 2018.
March 12, 2019
10:00 AM PT
Take action: Install standalone security updates to introduce SHA-2 code sign support for Windows 7 amd Windows Server 2008 R2
A standalone SHA-2 code signing support update for Windows Server 2008 R2 and Windows 7 is now available, as is a servicing stack update for Windows 7 SP1 and Windows Server 2008 R2 SP1 that includes the SHA-2 code signing support update.
March 12, 2019
10:00 AM PT
Take action: Install standalone update for WSUS 3.0 SP2 to support the delivery of SHA-2 signed updates
A standalone update, KB4484071 is available on Windows Update Catalog for WSUS 3.0 SP2 that supports delivering SHA-2 signed updates. For those customers using WSUS 3.0 SP2, this update should be manually installed no later than June 18, 2019.
March 12, 2019
10:00 AM PT
Reminder: Final Delta update for Windows 10, version 1607, 1703, 1709, and 1803 will be April 9, 2019
March 12th and April 9th will be the last two Delta updates for Windows 10, version 1607, 1703, 1709, and 1803. Security and quality updates will continue to be available via the express and full cumulative update packages.
March 12, 2019
10:00 AM PT
How do we measure and improve the quality of Windows?
Measuring the quality of Windows is a complex undertaking that requires gathering a variety of diagnostic signals from millions of devices within the Windows ecosystem. In addition to rigorous internal testing, we rely heavily on the feedback provided through diagnostic data to detect and fix problems before we release new updates of Windows to the general population, and to monitor the impact of those updates after each release.

Get insight into some of the practices we employ to measure and improve the quality of Windows.
March 06, 2019
10:23 AM PT
Getting to know the Windows update history pages
Windows update history pages offer detailed information about each Windows update: the type of update, which operating systems it affects, the improvements and fixes included, and how to get the update. See how simple it is to use this important resource to access information for Windows 10, Windows Server 2019, and earlier versions of the Windows and Windows Server operating systems.
February 21, 2019
06:37 PM PT
Share your feedback: Windows update history
We read every comment you leave on our update history pages, and are always looking to improve these pages and the monthly knowledge base (KB) articles that accompany each monthly update. Take our survey and let us know how we can improve our transparency further and make these more compelling and useful to you and your organization.
February 21, 2019
12:00 PM PT
Plan for change: Windows Update for Business and the retirement of SAC-T
Beginning with Windows 10, version 1903 (the next feature update for Windows 10), the Windows 10 release information page will no longer list SAC-T information for version 1903 and future feature updates. Instead, you will find a single entry for each new SAC release. In addition, if you are using Windows Update for Business, you will see new UI and behavior to reflect that there is only one release date for each SAC release. If you use System Center Configuration Manager, Windows Server Update Services (WSUS), or other management tools, there will now only be one feature update published to WSUS, and this will occur at the time of release. Learn how this change will affect Windows Business for Update customers.
February 14, 2019
12:00 PM PT
Champs corner: Classifying Windows updates in common deployment tools
If you utilize automated update deployment tools, such as Windows Server Update Services (WSUS) or System Center Configuration Manager, you likely use automatic rules to streamline the approval and deployment of Windows updates. Using the correct update classification is, therefore, an important component of your organization’s device update process. Explore the options available and how to approach it in a WSUS or Configuration Manager environment.
February 05, 2019
10:34 AM PT
Update: Delta updates for Windows 10, version 1607, 1703, 1709, and 1803 will be available until April 9, 2019
Based on customer feedback, we are extending Delta update publication for Windows 10 versions 1607, 1703, 1709, and 1803. We will continue to provide Delta updates via the Microsoft Update Catalog through April 9th, 2019, which will be the last delta update available.
February 05, 2019
09:00 AM PT
Global DNS outage affecting Windows Update customers
Windows Update customers were affected by a network infrastructure event on January 29, 2019 (21:00 UTC), caused by an external DNS service provider’s global outage. A software update to the external provider’s DNS servers resulted in the distribution of corrupted DNS records that affected connectivity to the Windows Update service. The DNS records were restored by January 30, 2019 (00:10 UTC), and the majority of local Internet Service Providers (ISP) have refreshed their DNS servers and customer services have been restored.

While this was not an issue with Microsoft’s services, we take any service disruption for our customers seriously. We will work with partners to better understand this so we can provide higher quality service in the future even across diverse global network providers.

If you are still unable to connect to Windows Update services due to this problem, please contact your local ISP or network administrator. You can also refer to our new KB4493784 for more information to determine if your network is affected, and to provide your local ISP or network administrator with additional information to assist you.
January 29, 2019
04:15 PM PT
Application compatibility in the Windows ecosystem
Our application ecosystem is incredibly diverse, encompassing tens of millions of applications (apps) with numerous versions, languages, architectures, services and configuration options. While our ecosystem is complex, our vision is simple. All apps on Windows devices should just work! Explore the various programs and technologies we use to improve application compatibility.
January 15, 2019
10:00 AM PT
Modern desktop servicing: the year in review
2018 was a pivotal year for the modern desktop and the servicing transformation journey we have been taking with you and your organization. In this post, John Wilcox takes a look back and recaps the progress that has been made, highlighting significant events, and provideing nsight into what 2019 has in store.
December 19, 2018
02:20 PM PT
Driver quality in the Windows ecosystem
Ensuring Windows 10 works great with all the devices and accessories our customers use is a top priority. We work closely with this broad mix of partners to test new drivers, monitor health characteristics over time, and make Windows and our ecosystem more resilient architecturally. Our goal is to ensure that all the updates and drivers we deliver to non-Insider populations are validated and at production quality (including monthly optional releases) before pushing drivers broadly to all. Explore the driver distribution chain and learn how we measure driver quality and prevent conflicts.
December 19, 2018
10:04 AM PT
Introducing the Modern Desktop podcast series
In this new podcast series, we'll explore the good, the bad, and, yes, the ugly of servicing and delivery for Windows 10 and Office 365 ProPlus. We'll talk about modern desktop management through Enterprise Mobility, security, and cloud-attached and co-managed environments. Listen to the first episode, in which we discuss monthly quality updates fpr Windows 10, the Microsoft 365 Stay Current pilot program, and interview a real customer to see how they ingest monthly updates in their organization.
December 18, 2018
01:00 PM PT
Measuring Delivery Optimization and its impact to your network
If you've familiarized yourself with the configuration options for Delivery Optimization in Windows 10, and have started to configure the settings you feel will be the best fit for your organization’s network topology, now is the time to see how well those settings are working. This article provides tips on how evaluate performance at the device level or organization level.
December 13, 2018
03:48 PM PT
Windows monthly security and quality updates overview
Today’s global cybersecurity threats are both dynamic and sophisticated, and new vulnerabilities are discovered almost every day. We focus on protecting customers from these security threats by providing security updates on a timely basis and with high quality. Find out how we deliver these critical updates on a massive scale as a key component of our ongoing Windows as a service effort.
December 10, 2018
10:00 AM PT
LTSC: What is it, and when should it be used?
With the Semi-Annual Channel, devices receive two feature updates per year, and benefit from the best performance, user experience, security, and stability. This servicing option continues to be our recommendation for managing Windows 10 updates; however, we acknowledge that certain devices and use cases (e.g. medical systems and industrial process controllers) dictate that functionality and features don’t change over time. Find out how we designed the Long-Term Servicing Channel (LTSC) with these types of use cases in mind, and what is offered through the LTSC.
November 29, 2018
07:02 PM PT
Plan for change: Local Experience Packs: What are they and when should you use them?
When we released Windows 10, version 1803, we introduced Local Experience Packs (LXPs), which are modern language packs delivered through the Microsoft Store or Microsoft Store for Business. Learn about the biggest advantage to LXPs, and the retirement of legacy language packs (lp.cab) for all Language Interface Packs (LIP).
November 14, 2018
11:10 AM PT
Windows 10 Quality approach for a complex ecosystem
While our measurements of quality show improving trends on aggregate for each successive Windows 10 release, if a single customer experiences an issue with any of our updates, we take it seriously. In this blog post, Windows CVP Mike Fortin shares an overview of how we work to continuously improve the quality of Windows and our Windows as a service approach. This blog will be the first in a series of more in-depth explanations of the work we do to deliver quality in our Windows releases.
November 13, 2018
10:00 AM PT
Windows 10, version 1809 rollout resumes; now available on VLSC
Today we are resuming the rollout of the latest Windows 10 feature update—Windows 10, version 1809—via the Software Download Center (via Update Assistant or the Media Creation Tool), Windows Server Update Services (WSUS), and Windows Update for Business. Windows 10, version 1809 is also now available on the Volume Licensing Service Center (VLSC).
November 13, 2018
10:00 AM PT
Express updates for Windows Server 2016 re-enabled for November 2018 update
Starting with the November 13, 2018 Update Tuesday release, Windows will again publish Express updates for Windows Server 2016. That means that system administrators for WSUS and System Center Configuration Manager will once again see two packages for the Windows Server 2016 update: a Full update and an Express update. Read this article for more details.
November 12, 2018
03:00 PM PT
Plan for change: 2019 SHA-2 code signing support requirement for Windows and WSUS
To protect your security, Windows operating system updates are dual-signed using both the SHA-1 and SHA-2 hash algorithms to authenticate that updates come directly from Microsoft and were not tampered with during delivery. Due to weaknesses in the SHA-1 algorithm and to align to industry standards Microsoft will only sign Windows updates using the more secure SHA-2 algorithm exclusively.

Customers running legacy OS versions (Windows 7 SP1, Windows Server 2008 R2 SP1 and Windows Server 2008 SP2) will be required to have SHA-2 code signing support installed on their devices by July 2019. Any devices without SHA-2 support will not be offered Windows updates after July 2019. To help prepare you for this change, we will release support for SHA-2 signing in 2019. Windows Server Update Services (WSUS) 3.0 SP2 will receive SHA-2 support to properly deliver SHA-2 signed updates. Please make note of the dates in the migration timeline and plan accordingly.
November 09, 2018
10:00 AM PT