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This article describes the Windows 3.x calendar. For the Windows Vista calendar, see Windows Calendar.
Microsoft Calendar Month View.png
Month view in Calendar
Developer(s) Microsoft
Initial release November 1985
Operating system Microsoft Windows
Type Personal information manager
License Proprietary software

Calendar is a personal organiser program that was distributed with Microsoft Windows from version 1.01 until Windows 3.11. It was superseded by the calendar in Microsoft Schedule+, which was included in Windows for Workgroups and Windows NT. Windows 95, Windows 2000 and their descendants did not include a calendar program until Windows Vista introduced Windows Calendar.

Saved Calendar files have the extension .cal. The Calendar file format was one of those described in Volume 4 of Microsoft's Windows 3.1 Programmer's Reference. [1]


  1. ^ Microsoft Corporation, "Microsoft Windows 3.1 Programmer's Reference. Volume 4: Resources", Microsoft Press, 1992, ISBN 1-55615-494-1


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