1990 – Windows 3.0 is released 1991 – Windows 3.0a is released 1992 – Windows 3.1 is released 1993 – Windows for Workgroups 3.11 is released

Windows 3.0: This was the first successful version of Windows and was released in 1990. It had improved graphical capabilities, virtual memory support, and improved memory management.

Windows 3.0a: This was an updated version of Windows 3.0 and was released in 1991. It contained bug fixes and support for MS-DOS 5.0.

Windows 3.1: This version was released in 1992 and it included support for TrueType fonts and multimedia capabilities. This version was more user-friendly and had a more refined graphical user interface.

Windows for Workgroups 3.11: This version was released in 1993 and it was specifically designed for networking. It introduced support for peer-to-peer networking and made it easier for users to connect to other computers on a network.

Windows 3.21 was a version of Microsoft Windows released in 1993. It was a minor update to Windows 3.1 that included support for Point-to-Point Protocol (PPP) and improved stability and performance. The update also included several bug fixes and security enhancements. Windows 3.21 was targeted towards business users and was often bundled with new computers. Although it was a minor release, it was widely adopted and was considered to be a successful version of Windows.

Note: This timeline only covers the major releases of Windows 3 and doesn’t include service packs or minor updates.