The Application Experience Lookup Service is a new service that was introduced in Windows Server 2003 Service Pack 1 (SP1). This service is part of an infrastructure that automatically applies software updates to programs to make sure that they run on newly released service packs and newly released versions of the Windows operating system.

Note Windows Server 2003 SP1 is included in x64-based versions of Windows Server 2003.

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The Application Experience Lookup Service is a part of the Application Compatibility Administrator. The Application Experience Lookup Service provides support for Windows Server 2003 computers on a domain. This service reports on compatibility issues and automatically applies software updates to programs.

The Application Experience Lookup Service must be running for the software updates be applied. You cannot customize the Application Experience Lookup Service. This service is used by the operating system internally. This service does not use any Active Directory, network, or Internet resources.

The functionality of the Application Experience Lookup Service can be disabled though Group Policy settings for program compatibility. When this setting is disabled, the service will continue to run, but no calls will be made to the service. The service cannot be stopped or disabled.

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Technical support for x64-based versions of Microsoft Windows

Your hardware manufacturer provides technical support and assistance for x64-based versions of Windows. Your hardware manufacturer provides support because an x64-based version of Windows was included with your hardware. Your hardware manufacturer might have customized the installation of Windows with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your x64-based version of Windows. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site: For product information about x64-based versions of Microsoft Windows Server 2003, visit the following Microsoft Web site:

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For more information about Group Policy Software installation extension tools and settings, visit the following Microsoft Web site:

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