The following is a list of Windows operating systems and the versions of IIS or PWS that they support.
| Windows Operating System | Version of IIS or PWS |
| Windows 95, 98 | Personal Web Server |
| Windows NT 4 | IIS 4.0 |
| Windows NT 4 Workstation | Personal Web Server |
| Windows 2000 Professional | IIS 5.0 (limited version) |
| Windows 2000 Server (all versions) | IIS 5.0 |
| Windows XP Professional | IIS 5.1 |
| Windows Server 2003 | IIS 6.0 |
