I have been using Openoffice since it was Staroffice, not just because it is extra cheap but because it runs on everything I have, from Windows 2000 to Vista, plus Linux, and it would run on a Mac if I had that. And now there are some very good epub extensions (especially writer2epub) that ease the transition from manuscript to ebook. I just bought my first copy of MS Office (2007) ever last year because I needed Excel for a particular job, and find it quite good, but Openoffice remains the standard for me.
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