XWEB: Requirements for Outlook Web Access

This article lists the requirements for Outlook Web Access (OWA).

Server Requirements

To install the OWA components on a server, the following hardware and software is required:

• Single or dual 60-megahertz (MHz) Pentium microprocessor (Pentium 133 recommended)
• 64 megabytes (MB) of RAM
• High-speed network connection to Microsoft Exchange Server
• Microsoft Windows NT Server 4.0 with Service Pack 3 or later (the latest service pack for Windows NT Server 4.0 is recommended)
• Microsoft Internet Information Server (IIS) 3.0 or later
• Active Server Pages (ASP)
  You can install the ASP components from the latest Windows NT Server 4.0 service pack CD-ROM. The ASP components are also included with IIS 4.0.

NOTE: Outlook Web Access is included with Exchange Server 5.5. Microsoft recommends that you apply the latest service pack for Exchange Server 5.5, because it includes enhanced Outlook Web Access components. For additional information about how to obtain the latest service pack for Exchange Server 5.5, click the article number below to view the article in the Microsoft Knowledge Base:

Client Requirements

To connect to an OWA server, you must have a compatible Internet browser such as the following:

• Microsoft Internet Explorer 3.02 or later
• A third-party Internet browser that supports frames

Additional Resources

For detailed deployment instructions and troubleshooting suggestions for implementing OWA, please see the "Planning and Deploying Outlook Web Access" document that is available at the following address on the World Wide Web: For information about troubleshooting known issues with the OWA components, please see the OWA troubleshooter that is available at the following address on the World Wide Web: