To design applications for Microsoft Exchange Server, you need the following software installed on your system:
Microsoft Windows NT Server version 3.51 with Service Pack 5 or Microsoft Windows NT Server version 4.0 with Service Pack 2 (Note: Service Pack 3 is preferable due to its security enhancements.)
Microsoft Exchange Server must be running on the domain.
Microsoft Platform SDK.
Microsoft Visual C++ version 4.0 is required. Earlier versions are not supported.
Sample applications may require the Administrator program to be running on the development computer. You may also need to install Microsoft Exchange Server and Microsoft Exchange Client.