The future of computing is at hand, and my crystal ball says that it will take place on a browser. Perhaps not on Internet Explorer or Firefox, but on a successor. Very shortly, you will not need Microsoft Office to do your word processing and PowerPoint presentations. You will just select the web site that provides the functionality you need and get to work. This has many advantages to the user.
First, let's look at a few examples of this that are already happening: When writing on something that does not have a built-in spell checker, such as a birthday card or the text field on a web site you want to comment on, I used to open up Microsoft Word to check the spelling of a word I was not sure about. But now, I just type the word into my Google toolbar and get the result much faster.