Now it's Ecomstation TODAY MARKS the 25th birthday of OS/2, which IBM announced on 2 April, 1987.Initially intended as a protected mode successor to PC-DOS, OS/2 became the first serious PC operating system rival to Microsoft Windows. For a while, IBM and Microsoft collaborated on it, until Microsoft withdrew its support for various reasons and focused its efforts on Windows NT instead. OS/2 has never fully recovered from Microsoft's abandonment of it, nor has Windows.However, throughout most of the 1990s, OS/2 was a much more stable, secure and reliable PC operating system than Windows. It was capable of running Windows...