Although I have regularly used Microsoft Office in the past, I haven't even had it installed on my system for over a year. This is despite completing a thesis, working with legal documents, exchanging business documents, writing academic papers for publishing as well as creating software based presentations.
I have NOT needed MS Office to do any of these things. OpenOffice.org is adequate - it has all the essential features, including style list functions for real publishing, document comparison capabilities and import/export abilities, a capable spreadsheet, and a presentation program that does its job while importing and exporting PowerPoint.
But it's not just that OpenOffice.org is "adequate" for the job. As a software developer and long time computer user, I think OpenOffice.org is superior in several important respects. I would like to describe these points, because I think that others will also understand the issues better when they recognize the implications for themselves:
pc-tools