You can upgrade a Microsoft SQL Server 4.2 for OS/2 server to Microsoft SQL Server 6.0 by first upgrading the operating system to Windows NT Server and then running the SQL Server setup program to upgrade the SQL Server files.
If you will be installing SQL Server 6.0, upgrade from OS/2 to Windows NT Server version 3.5 or later. Version 3.51 is recommended. If you will be installing SQL Workstation 6.0, upgrade to Windows NT Workstation version 3.5 or later. Version 3.51 is recommended.
For operating-system upgrade information, see your manuals for Windows NT.