The SQL Server Upgrade Wizard supports upgrading from SQL Server 6.0 and SQL Server 6.5. Before upgrading from SQL Server 6.0, Service Pack 3 for SQL Server 6.0 must be installed. Before upgrading from SQL Server 6.5, Service Pack 3 for SQL Server 6.5 (or a later service pack) must be installed. If you are currently running SQL Server version 4.21a (or earlier), you must upgrade to SQL Server 6.0 or 6.5 first, and then upgrade to SQL Server 7.0. It is recommended that you upgrade to SQL Server 6.5 directly and then upgrade to SQL Server 7.0.
SQL Server 6.0 requires Microsoft Windows NT version 3.5 or later. SQL Server 6.5 requires Windows NT 3.51 or later. SQL Server 7.0 requires Windows NT version 4.0 with Service Pack 4 or later. If you are planning to use the same computer for SQL Server 7.0, you must first upgrade the computer to Windows NT 4.0, apply Service Pack 4 for Windows NT, install SQL Server 7.0, and then begin the upgrade process.
Microsoft supports SQL Server 6.0 on Windows NT 4.0 only during the process of a one-computer upgrade to SQL Server 7.0. If you are running SQL Server 6.0 on Windows NT 3.5, you must first upgrade to Windows NT 3.51 (Service Pack 5 is recommended) for a two-computer upgrade, or to Windows NT 4.0 for a one-computer upgrade before you begin the upgrade process.