Microsoft builds some really powerful tools for document processing and more. Their office suite has one of the largest user bases in the world. Along with all that power comes a pretty hefty price tag. Many of my clients do not have the budget for Microsoft Office nor do they want another monthly bill for Office Online. For those of us who need an office suite I can find no better software than LibreOffice from the Document Foundation. This is open source software at it's finest. The software is free and runs on Windows, Mac OS X, and Linux.
Visit their web site http://www.libreoffice.org to learn more about their software and download it for free.