JSI Tip 6634. How do I configure Integrated Windows authentication (formerly named NTLM or Windows NT Challenge/Response authentication) for Microsoft Outlook Web Access (OWA) and Microsoft Exchange Server 5.5?

Microsoft Knowledge Base Article 300656 contains the following summary:

This step-by-step article describes how to configure Integrated Windows authentication (formerly named NTLM or Windows NT Challenge/Response authentication) for Microsoft Outlook Web Access (OWA) and Microsoft Exchange Server 5.5.