If you have not used Open Office, you should try it out. It is a free open source MS-Office equivalent. It is compatible with Word, Powerpoint, Excel, Lotus etc etc. Pretty versatile I should say. You can open an office doc and save as an office doc.
By far the best feature, I have used/like in OpenOffice is its ability to export to pdf.
For those who have used/who use OpenOffice, there is a new portable open office executable available. This could be loaded onto a USB jump drive for an office software on-the-go.