http://wwwhahahahahahaoffice.org
OpenOffice is just like MS Office but it's free. Since Star Office isn't free any more this is the next best thing. Actually, Star Office is OpenOffice, just branded with sun's logo.
This is the most valuable software you will ever download. I had a bunch of untargetted mainstream traffic from my expired domains that was making me under $1/K. After a few hours of letting traffic from one of the domains go to a carefully made surfer trap, I put the results into the spreadsheet. Tweaked the keywords one time to replace the garbage with better converting ones. Here's the result:
Tweak your results and you'll be able to see how much it was worth using a spreadsheet. A few minutes a day for a few days can turn your unused traffic into a cash generating machine. Same goes with all your traffic.