was the default operating system on the original ThinkPad 700.

IBM and Microsoft's joint operating system, known as Operating System/2 (OS/2), although not as popular, was also made available as an option from the ThinkPad 700 in 1992, and was officially supported until the T43 in 2005.

The ThinkPad Power series line, sold from 1994 through 1998, was available with AIX and Solaris

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