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I use OpenOffice myself on my own computer and it does most things that Microsoft Office does, but not everything.
For example, yesterday I wanted to do a word count. In Microsoft Word you can do this for the whole document or just a selection, but in OpenOffice Writer you can only do this for the whole document. I also use a very nice toolbar, which is a macro, and it only works in Word (www.teachers-pet.org).
Anyway, that's beside the point. Much as I like free software, the fact is that 99% of computer iusers are familiar with Word and 1% are familiar with OpenOffice. So, if we went for OpenOffice, people would have to spend time learning how to use it and people would ask me lots of questions about how to use it. So, since my time is not free, it would not be free!
Thanks for the suggestion though.