For some time I've been meaning to tell you all about one of the niftiest FREE software suites available for PC or Mac. It's Open Office, and it is incredible in that it is mimics the Microsoft Office suite - Excel, Word, etc.
You can download it free, and use it just like you use the much more expensive MS softwares. You can save as an Open Office file format or in the MS software format.
I've used it extensively, and I've yet to find a problem with it.
FREE and perfectly usable. That's a combo that can't be beat.