XWEB: Active Server Components Not Compatible with IIS 4.0 (176587)

SYMPTOMS

You may experience either of the following symptoms:

When you are logging on to a Microsoft Exchange Server computer using the Microsoft Outlook Web Access (OWA) client, you may receive the following error message:
HTTP Error 401 401.1 Unauthorized: Logon Failed.
While attempting to install the Active Server Components shipped with Microsoft Exchange Server version 5.0 on a computer running Internet Information Server (IIS) version 4.0, you may receive one of the following error messages:

To install the Active Server Components you need to have previously
installed Windows NT 4.0, Internet Information Server (IIS) and
Active Server Pages. Microsoft Exchange Server Setup
ID no: c1032b99
-or-
The Active Server Components failed to install properly.
If you click OK after receiving the second error message, you receive the following additional error message:

The system cannot find the file specified.
Microsoft Windows NT
ID no: 0xc0020002

CAUSE

Internet Information Server (IIS) version 4.0 has been installed and configured to access the computer running Exchange Server 5.0. IIS 4.0 is not supported by the Exchange Server version 5.0 Active Server Components. IIS 4.0 is supported by Exchange Server version 5.5.

WORKAROUND

To work around this behavior, to use the Microsoft Exchange Server, version 5.0 Active Server Components on the computer that runs IIS, you must perform the following steps:

Remove IIS 4.0.
Install IIS 3.0.
Run the Microsoft Exchange Server, version 5.0, Setup program and install the Active Server Components.
Install IIS 4.0 to upgrade the computer.

Another option is to run the Microsoft Exchange Server, version 5.5, Setup program and install the Outlook Web Access components on the IIS 4.0 server.