Microsoft
Yes, you can.
Windows NT
Windows NT
OS/2 is a computer operating system, initially created by Microsoft and IBM, then later developed by IBM exclusively. The name stands for "Operating System/2," because it was introduced as part of the same generation change release as IBM's "Personal System/2 (PS/2)" line of second-generation personal computers.
What are the advantages and disadvantages of OS2?
OS/2 was developed by Microsoft and IBM before NT was developed. No doubt discoveries made by the Microsoft side while OS/2 was under development went into NT when Microsoft developed it. I've seen programs state compatibility between OS/2 and the Win 9x line of operating systems along with NT4.
os2
Oxygen sulfide
No.
It is not connected to Windows 7 in any way. Mac OS2 introduced multiple folders, a "Shut Down" command and Screenshots. That is the only similarities to Windows 7.
Originally, Windows NT was to be known as OS/2 3.0; the connection is actually quite intimate. Windows NT resulted from the fact that IBM and Microsoft decided to go their own ways with OS/2 after the success of Windows 3.0. Microsoft added a Windows-like API to "their" OS/2, on top of the OS/2 API, and christened the result "Windows NT" (mid 1993; there were a number of other differences between early Windows NT and OS/2, but the API was the principal one). IBM continued development of OS/2, with a more-or-less "native" API. Windows NT and OS/2 continued to diverge over the next few years. For more, see this excellent article on Windows NT: http://en.wikipedia.org/wiki/Windows_NT