Presentation Manager (PM) was the name given to the Graphic User Interface (
GUI) which
IBM introduced in version 1.10 of its operating system
OS/2 in 1988.
At the time, IBM and
Microsoft were collaborating on subsequent version of OS/2; IBM was preparing version 2.0 for the i386 processor, making it the first true 32-bit operating system for personal computers.
Microsoft began to develop OS/2 3.0 which was intended to be a network server.
However, during 1990, version 3.0 of
Windows was beginning to sell, and Microsoft began to loose interest in OS/2.
The companies parted ways, and IBM took over all of subsequent development.
Microsoft took with it OS/2 3.0, which it renamed Windows NT; as such, it inherited certain characteristics of PM.
IBM continued to develop PM, but in subsequent versions of OS/2, the name was dropped; there was no distinction made between the operating system and the GUI.