Windows 3.x can refer to either an individual or all of the following versions of Microsoft Windows:

• Windows 3.0
• Windows 3.1x
• Windows 3.2

These should not be confused with the first three releases of Windows NT, which were also given "3.x" version numbers, i.e.

• Windows NT 3.1
• Windows NT 3.5
• Windows NT 3.51

Note: Since the first Windows NT's version was derived from the consumer Windows 3.1, it served as a double entendre as it was also one number up from OS/2 2.1 since OS/2 spun off into Windows NT after IBM's relationship with IBM split.

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