Error message when users try to connect to Outlook Web Access 2007: "HTTP 500 Internal Server Error"

In an Exchange Server 2007 environment where the Client Access Server role is running on a Windows Server 2008-based server, users receive the following error message when they try to connect to Outlook Web Access 2007:

Additionally, the following error is logged in the Application log:

Log Name: Application
Source: Application Error
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
Description:
Faulting application w3wp.exe, version 7.0.6001.18000, time stamp 0x47919ed8, faulting module exprox.dll, version 8.1.278.0, time stamp 0x47f36917, exception code 0xc0000005, fault offset 0x0000000000068511, process id 0x%9, application start time 0x%10.

This problem occurs when you enable HTTP redirection on the Windows Server 2008-based server.

To resolve this problem, download and install Update Rollup 5 for Exchange 2007 Service Pack 1. For more information about Update Rollup 5 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:

For more information about HTTP redirection, visit the following Microsoft Web sites: