Topic Last Modified: 2009-01-21

The Microsoft Exchange Server Best Practices Analyzer Tool analyzes Internet Information Services (IIS) components that are installed on an Exchange server to determine whether the following conditions are true:

• The server is running a 64-bit version of Windows Server 2003.
  
  
• The 32-bit version of ASP.NET is installed in IIS.
  
  

If the Analyzer detects that the 32-bit version of ASP.NET is installed on a computer that is running a 64-bit version of Windows Server 2003, the tool generates an error message.

The ASP.NET component is required to enable Microsoft Office Outlook Web Access. However, if the 32-bit version of ASP.NET is installed together with a 64-bit version of Windows, Outlook Web Access users receive a "Service unavailable" error message when they try to access an Exchange mailbox.

You may have installed the 32-bit version of ASP.NET to meet the requirements of one or more installed programs. For example, an Exchange server may be running Windows SharePoint Portal Services.

To address this issue, run the ASP.NET IIS Registration Tool (Aspnet_regiis.exe) to enable the 64-bit version of ASP.NET in IIS.

To enable the 64-bit version of ASP.NET in IIS 6.0

1. Open a command prompt, and then move to the following directory:

   %SYSTEMROOT%\Microsoft.NET\Framework\v2.0.50727

2. Type the following command, and then press ENTER:

   	Copy Code
   aspnet_regiis -r -enable

3. Exit the command prompt.

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