What kinzel says is a good thought (I was thinking the same, because I am thinking about switching to Linux).

You can also investigate
Open Office (http://www.openoffice.org/). Open Office is an open source code project which provides applications for word processing, spreadsheets, presentations, and can work with a wide variety of file formats including Microsoft. One of their goals is to provide software that works on all platforms, and they do offer a version which works on Linux.

(Wandered in via starcat_jewel's LJ)