There may be some compatibility issues ,, check that,,,,
THere ARE compaitibilty issues between MS Office and openOffice.
Creating files in one and trying to open them or manipulate them in the other,,, COULD <- Big Could) cause corruption of the files.
You are best to either make a backup of all the files till you are certain that none of them get corrupted.
If they do, you can always recover a copy of the back up, open it in OOW and copy paste to Word to recreate it.
Or, as you use them, Copy and paste from OOW to Word to be certain you don't run into file corruption.
Why am I saying this? Cause we tested Open Office with MS Office and many problems were found and decided to not use OO at this time, there is a lot of tweaking that needs to be done to resolve conflicts.
Just a warning that this was not just myself testing, but about 50 and we all had problems of some kind.
Incidentally, I prefer MS Office over OpenOffice.