The following operating system supports the ThinkPad T20:

• Microsoft Windows 2000

Previous versions of this operating system is not supported.

Operating systems other than those preinstalled on the systems may not provide full-feature functionality.

• Closed caption option is not available on DVD Express on T20 systems running Microsoft Windows NT 4 or Windows 2000. Subtitles are available which may work instead.
• Installation of DVD Express in Windows NT 4 or Windows 2000 requires administrator privileges.