I've not had good results with Open Office. I definately had compatibility issues between that and Micro Soft office. If I used Open Office in my own PC only... every thing was ok, if I sent a doc... it did not get to the recipient in any usable form. The recipient was not able to change, edit or salvage the doc in any usable format. Open Office particulary had problems translating bullets, symbols etc.
Due to the ill view of Sun by Micro Soft these issues will not likely be resolved. If this free software works fou you, then by all means enjoy it. I LOVE free