There are many ways to approach the task of performing an upgrade from Microsoft Windows NT Server 4.0 operating system environments to a Microsoft Windows Server 2003 environment. Each upgrade has to be analyzed and planned to determine the best possible approach for a specified scenario. This guide provides several scenarios to help you plan and execute an upgrade process in your organization. When deciding how to upgrade, many questions must be addressed. What are the supported upgrade paths from Windows NT Server 4.0 to the desired version of Windows Server 2003, whether that is Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; or Windows Server 2003, Web Edition? Will existing applications running on Windows NT Server 4.0 run on Windows Server 2003? What factors determine the order of Windows NT server upgrades? Is there a need to upgrade the domain to the Microsoft Active Directory directory service? Is Microsoft Exchange Server a consideration for your upgrade?