Apache Open Office has everything you need to get off of Microsoft for good. It is open-source software that not only competes with Microsoft, but seems to betters it in many ways by adding features that are not available in Microsoft products.
It is a full suite of Microsoft-Office-like products including a word-processor, applications for spreadsheets, presentations, drawing and databases. One of the most important features is that all documents can be saved in formats that are Microsoft-Office compatible. So, for those who want to work from their home computer, but share with the world, there will be no problem.
Download for free, virus free, from the Source Forge.