Track Changes
I have worked for some companies that religiously used the track changes and comments functions when editing documents among different people. Happily, I can say there seems to be no reason you can't get right in the group editing frenzy and still use Open Office. Text changes were all preserved between the two rival systems as were comments. I could even see who had made the edits based on their user's initials (which are setup in the program itself), another neat feature that worked well in both. The colors used for the changes was different, but this is customizable in Options under the Tools menu . The comments were also preserved. However, unlike MS Word, a comment in OOO is only shown as one space instead of being able to select a whole range of text. Functionally, the comments work the same, though.

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