Here's some GREAT software and yes, it's FREE. This is not a one-time offer, but standard practice from Sun Microsystems.
They offer a complete office suite which is totally compatible with Microsoft Office. Yes, it has ALL the features of your current office suite, and even has the ability to convert files to PDFs.
No more paying for upgrades from Microsoft. No more worrying about having different versions on different computers, or having to type in burdensome registration numbers. No more worries about having to upgrade and dishing out hundreds of dollars each time you switch.
It's a simply download and install, and you can open up all your existing files, including WORD, POWERPOINT, etc. It looks and acts like Microsoft Office, so there is no steep learning/re-learning curve.
Give it a shot. I did! Three cheers to Open Office! 