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Patchday May 2021: Microsoft releases important updates for Windows 10


On May patch day 2021, Microsoft closes 55 vulnerabilities in Microsoft Office, Windows 10 and other programs. You should definitely install the updates.

  • The May Patchday 2021 closes various security gaps in Windows 10, Office and other Microsoft programs.
  • You should install the updates urgently. You can download it here.

The US company Microsoft has rolled out the cumulative updates for May Patchday 2021 for Windows 10 and Microsoft Office. This closes 55 vulnerabilities in the operating system. The most critical vulnerability concerns the HTTP stack. Hackers can send a special packet to affected servers and thus execute arbitrary code.

With the May Patchday, leaks in Microsoft Windows, .NET Core and Visual Studio, Internet Explorer, Microsoft Office, SharePoint Server, open source software, Hyper-V as well as Skype, Microsoft Lync and Exchange Server will be plugged. You should definitely install the updates.

The May patches are available. You can download it from our download archive and install it.

Note: For Windows build 1909 this is the last patch day. The system will no longer receive any security updates in the future.

If you are not sure which Windows version you are using, you can easily determine the version and build number under Windows 10.

This is how you install the updates

Windows 10 users usually receive the updates automatically. If available, they will be downloaded and installed the next time the system starts - provided you have not deactivated or paused the automated update in Windows 10.

If you want to check the Microsoft server for available updates yourself, you can find out in the following linked instructions how to manually install updates under Windows 10.

Windows Patchday: Which versions of 8.1 and 10 will receive updates?

Windows 10 Home and Pro receive 18 months of support for this version from the release of a new main version. Users of the Enterprise and Education versions, however, 30 months. Windows 8.1 has extended support until January 10, 2023. This means that these systems will still receive all important security updates. However, it is recommended that you switch to Windows 10 in good time.

For Windows 7, the patch day in January 2020 ended. Microsoft no longer provides the operating system with updates for private users.

The next dates for Microsoft Patchday 2021

Microsoft rolls out these security updates for Windows and its programs every second Tuesday of the month. Below you will find all the dates for 2021:

  • June 8, 2021
  • July 13, 2021
  • August 10, 2021
  • September 14, 2021
  • October 12, 2021
  • November 9, 2021
  • December 14, 2021

Please note, however, that due to the time difference in Germany, the updates are usually only distributed in the late evening. It is also possible to deviate from the time frame for very urgent updates. If not already installed, these patches also contain the updates of the latest updates.

Cancel or undo Windows updates

If the installation of a Windows update is inconvenient, the system offers you the option of pausing or canceling an update. You can find out how to cancel an ongoing update in the linked instructions. If the update is already installed and there are problems, then it helps to undo this update.

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You should also be careful when the package is downloaded in the background. This download or upload quickly gets in the way of gaming or streaming. With a few clicks, however, you can limit the download speed. If you are looking for even more tips and tricks, you will find all the instructions for Windows 10 linked.

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