of oo.o is also that you can make .doc files for those who only have ms word. I haven't used MS Office for almost 2 years. OO.o is wonderful, although querying a large dataset in OO.o Base (database app) could use some optimizations, but is still totally useable.
Yup, I've decided to go on a self-imposed challenge, to see if I can use OpenOffice.org for 1 university semester (March - July), without Microsoft Office co-existing on the same computer. This is to prove to myself that I can totally depend on an open-source office suite, and to see if I can still interact with my tutorial group members using the OpenDocument format.