SUMMARY

How to run MailEnable IIS ASP.NET applications in 32 bit mode on 64 bit Windows.

NOTE: This article only applies to version 2.x or prior to version 3.5.

DETAIL

Some non-MailEnable IIS applications (e.g. control panel applications) do not yet support native Windows 64 bit. As such, IIS (on Windows 64 bit installations) needs to be configured to run in 32 bit mode. 

If the server is configured to run IIS in 32 bit mode, it is important that ASP.NET is also configured to run in 32 bit mode. 

To allow ASP.NET applications to run on the server, IIS will need to be configured to run application pools in 32 bit mode. This can be done by executing the following procedure:

1. Install the 32 bit version of the Microsoft .NET framework 1.1 on the server

2. Click Start, click Run, type cmd, and then click OK.
Type the following command to enable the 32-bit mode:

cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1

3. Type the following command to install the version of ASP.NET 1.1 and to install the script maps at the IIS root and under:

%SYSTEMROOT%\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe -i

From within the IIS management console, make sure that the status of ASP.NET version 1.1.4322 is set to Allowed in the web service extension list in Internet Information Services Manager.

4. Form the Windows command prompt, type meinstaller.exe and press Enter.

From the menu presented, selection Option 13. Reset IIS Virtual Directory Configuration settings for ASP/ASPX platform.

When prompted to select the version of ASP.NET, select v1.1.4322 and then Apply.

Once the application has completed processing, select OK and close the MEInstaller application.

5. From the Windows Command Prompt type iisreset and select OK.

MORE INFORMATION

More information on configuring IIS with Windows 32 bit application on Windows 64 bit operating systems can be found in this Microsoft Knowledge Base article: http://support.microsoft.com/?id=894435