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When the technology was founded: Microsoft Office was first released in fall 1990 for Windows 3.0.
Why the technology will be around for another 20 years: Without doubt, Microsoft Office is one of the most used, and understandably the most expensive office and productivity suite of programs on the market. Because of its userbase in the hundreds of millions, ranging from large corporations to governments, it is almost as widely used as Windows itself.
But the one thing that hinders it the most is that bar the Office:mac edition, it only runs on the Windows platform. As so many people use Office as a document standard, it all but forces out competitors as its market dominates further.
There is a good reason why it has become what it is. Not only does it dole out everything that one needs in an office suite, but has always maintained its version history to each major release of the platforms it is supplied on; both Windows and Mac OS X.
Office will, in my opinion, no doubt survive for the next 20 years on any platform that Windows becomes or evolves into.