Windows 8.1 Windows 8.1.1 Update

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Microsoft have released Update 1 for Windows 8.1:

Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update is a cumulative update that includes all previous released security updates and nonsecurity updates. In addition to previous updates, it includes improvements such as improved Internet Explorer 11 compatibility for enterprise applications, usability improvements, extended mobile device management and improved hardware support. Additionally, this update enable Windows Server 2012 to support clustering configurations for hosts.

Important All future security and nonsecurity updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require this update to be installed. We recommend that you install this update on your Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2-based computer in order to receive continued future updates.

Improvements
This update includes the following new features and improvements:

• Enables a more familiar mouse and keyboard functionality for modern apps and controls.
• Improves the web application compatibility of the Internet Explorer 8 emulation mode in Internet Explorer 11 F12 Developer Tools.
• Increases performance and reliability when you use multi-display configurations for portrait-first device experiences.

Known issue
If you receive error 0x80071a91 when you install update 2919355, install update 2939087. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2939087 Error 0x80071a91 when installing update 2919355 in Windows
To fix an issue with the Internet Explorer Enterprise Mode feature which occurs after the update is installed, visit the following Microsoft website:
2956283 Internet Explorer 11 crashes when you turn on or turn off the Enterprise Mode feature
Prerequisites
To apply this update, you must be running Windows 8.1, Windows Server 2012 R2, or Windows RT 8.1. Additionally, you must have the following update installed:
2919442 A servicing stack update is available for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2: March 2014

Ref:
http://support.microsoft.com/kb/2919355

 

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Microsoft have released a new version of the above release:

Update replacement information
This update is a cumulative update that includes the security updates and the non-security updates for Windows 8.1 and Windows Server 2012 R2 that were released before March, 2014.
Known issues

• If you receive error 0x80071a91 when you install update 2919355, install update 2939087. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
  2939087 Error 0x80071a91 when installing update 2919355 in Windows
• To fix an issue with the Internet Explorer Enterprise Mode feature that occurs after the update is installed, go to the following Microsoft website:
  2956283 Internet Explorer 11 crashes when you turn on or turn off the Enterprise Mode feature
• 2959977 Windows Update Client SSL issue for Windows Server Update Services
• After the update is installed, you cannot uninstall Web Server (IIS) roles on Windows Server 2012 R2. To resolve the issue, visit the following KB article:
  2957390 You are unable to uninstall IIS after you install KB2919355 in Windows 8.1 or Windows Server 2012 R2

Prerequisites
To apply this update, you must be running Windows 8.1, Windows Server 2012 R2, or Windows RT 8.1. Additionally, you must have the following update installed:
2919442 A servicing stack update is available for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2: March 2014

Ref:
http://support.microsoft.com/kb/2919355

If you use Windows update you will already have this update (or should have ) this is only intended for those updating via standalone versions.

The standalone and ISO version of this update can be found here:
http://www.microsoft.com/en-us/search/DownloadResults.aspx?q=KB2919355