| OS | Level |
|---|---|
| Windows for Workgroups | 1 |
| Windows 95 | 1 |
| Windows 98 | 1 |
| Windows Me | 1 |
| Windows NT 3.x Workstation | 16 |
| Windows NT 3.x Server, member server | 16 |
| Windows NT 3.x Server, as PDC | 32 |
| Windows NT 4 Workstation | 16 |
| Windows NT 4 Server, as member server | 16 |
| Windows NT 4 Server, as PDC | 32 |
| Windows 2K Professional | 16 |
| Windows 2K Adv.Server, as member server | 16 |
| Windows 2K Adv.Server, as NT-PDC | 32 |
| Windows XP Home | 16 |
| Windows XP Professional | 16 |