QuickBasic (1985) 37 DOS

Microsoft QuickBasic, not to be confused with the lesser QBasic, was a Basic interpreter and compiler product loosely based on GW-Basic. Version 2.0 for DOS and later included an Integrated Development Environment. Microsoft also produced QuickPascal and QuickC with similar integrated environments.

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• 2.x
• 3.0
• 4.0
• 4.5

QuickC (1987) 9 DOS

Microsoft QuickC is a C compiler with an Integrated Development Environment, designed to compete with Borland Turbo C. It was targeted at home/hobbyist users with a much lower price tag than Microsoft's corporate-oriented professional products. Microsoft also produced QuickPascal and QuickBasic with similar integrated environments.

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• 2.x

QuickPascal (1989) 3 DOS

Microsoft QuickPascal was a short-lived dialect of Pascal created specifically to compete with Borland Turbo Pascal. It incorporated many Borland-specific features at the expense of backwards compatiblity with the earlier Microsoft Pascal product.

• 1.x

Virtual PC (1996) 33 Virtualization MacOS Mac OS X

Virtual PC started off originally as an x86 emulator for PowerPC Macintosh to run MS-DOS and Microsoft Windows. Connectix, the company that made it, was purchased by Microsoft. Virtual PC was then retooled into a virtualization tool for x86 systems. Microsoft discontinued Virtual PC in favor of a server-oriented virtualization product called Hyper-V.

• 7.x

Windows SDK & DDK (1986) 85 DOS

The Microsoft Windows Software Development Kits (SDK) provide sample program code, extra libraries, and documentation to aid application developers producing Windows applications. Microsoft Windows Driver Development Kits are similar sets of samples and libraries but specific to device driver development, and much more in-depth.

• Windows 2.x

Workgroup Add-On (1994) 0 DOS

The Microsoft Workgroup Add-On for MS-DOS is the easy way to connect users of MS-DOS to networks based on Microsoft windows. Now you can share documents, messages, and printers among PCs running MS-DOS and connect to Windows-based PCs too. It could be just what you need to make the most of older PCs and start networking.

• 1.x