Windows 3.0 is a Microsoft Windows version that was released on May 22, 1990. It, like its predecessors, is an operating system that runs on top of MS-DOS. Work on Windows 3.0 began at Microsoft in 1988, when David Weise and Murray Sargent decided separately to create a protected mode for Windows applications to allow reliable multitasking. Protected memory only supported DOS applications in older versions of Windows 2.xx for 386 CPUs. The team put together a crude prototype that could concurrently run Windows versions of Word, Excel, and PowerPoint, then presented it to business management, who were impressed enough to authorise it as an official project.