Compatibility update for the web, store, and media upgrade experience for Windows 8.1 and Windows Server 2012 R2: May 2014

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Summary

This update improves the web, store, and media upgrade experience when you upgrade to the latest version of Windows 8.1 or Windows Server 2012 R2. Additionally, this update provides the latest compatibility status of the applications, devices, and drivers that are already installed on your computer. Check out the changes in this upgrade behavior when you install the update.

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More Information

Update information

How to obtain this update

This compatibility update is offered when you upgrade to the release version of Windows 8.1 or Windows Server 2012 R2.

Upgrade actions

This compatibility update may trigger several actions when you upgrade to the latest version of Windows 8.1 or Windows Server 2012 R2. The following are the most common actions that may be triggered:

Upgrade block

This puts an upgrade block on an application that may cause the upgrade to Windows 8.1 or to Windows Server 2012 R2 to fail. Windows 8.1 and Windows Server 2012 R2 put an upgrade block on a third-party application only if the manufacturer is notified. The user must uninstall the application to continue with the upgrade.
Hard block

When a hard block is put on an incompatible application, you cannot run the application after you upgrade. Windows 8.1 and Windows Server 2012 R2 put a hard block on a third-party application only if the manufacturer is notified. Improves the user experience by warning the end-user and providing a "more information" URL about the product.
Soft block

A soft block notifies you when a primary function of an application may not work or may cause application instability. Improves the user experience by warning the end-user and providing a "more information" URL about the product.
Driver block

May block an existing driver on your computer when you upgrade to Windows 8.1 or to Windows Server 2012 R2. If this occurs, a driver for Windows 8.1 or Windows Server 2012 R2 is installed.
Block upgrade, can reinstall

This may block the upgrade to Windows 8.1 or Windows Server 2012 R2. To continue the upgrade, you must uninstall the application or driver. After Windows 8.1 or Windows Server 2012 R2 is installed, the application or driver can be reinstalled, and may then function correctly.
Reinstall after upgrade

Enables the upgrade to the release version of Windows 8.1 or Windows Server 2012 R2 to complete successfully. However, you can reinstall the application or device after the upgrade.
Migration block

This action blocks an incompatible application from being migrated either completely or partly during the upgrade from Windows 8 to Windows 8.1 so that the upgrade is completed successfully.

Changes in upgrade behavior when you install the update

Applications or devices may experience a change in behavior after this compatibility update is installed.

The following table lists the applications and devices that may be dynamically migrated when you update. This table also describes the behavior of these applications and devices after this compatibility update is installed.

Applications or Devices	Version	Behavior after you install the update
Marcrium Reflect	Up to 5.0.*	Blocks upgrade if the application is installed to prevent data loss.
Windows Mobile Device Center	6.1.*	Informs the user to reinstall this application after upgrade.
Kaspersky Endpoint Security	Up to 10.2.*	Blocks upgrade if the application is installed to prevent data loss.
Vmware Player	10.*	Informs the user to reinstall this application after upgrade.
Avira Antivirus	10.*	Informs the user to reinstall this application after upgrade.

Update replacement information

This update replaces the following update:

2933811 Compatibility update for the web, store, and media upgrade experience is available for Windows 8.1 and Windows Server 2012 R2: April 2014

File information

The global version of this update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

For Windows RT 8.1

File name	File version	File size	Date	Time	Platform
Drvmainarm.sdb	Not applicable	40,476	18-Apr-2014	02:39	Not applicable

For all supported x86-based versions of Windows 8.1

File name	File version	File size	Date	Time	Platform
Drvmain32.sdb	Not applicable	439,130	18-Apr-2014	02:48	Not applicable
Sysmain32.sdb	Not applicable	865,358	18-Apr-2014	02:48	Not applicable

For all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File name	File version	File size	Date	Time	Platform
Drvmain32.sdb	Not applicable	439,130	18-Apr-2014	02:44	Not applicable
Drvmain64.sdb	Not applicable	441,276	18-Apr-2014	02:44	Not applicable
Sysmain32.sdb	Not applicable	865,358	18-Apr-2014	02:44	Not applicable
Sysmain64.sdb	Not applicable	727,490	18-Apr-2014	02:44	Not applicable

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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