I do not understand why you need to save in ODF because OpenOffice can open
DOC.
OpenOffice might be a supported MSoft file format today, but it was not a
supported format when Office'03 came out. There is no saving to ODF that I
know of, and I do not see why you need to do it because DOC is a supported
OpenOffice format.
I get that you can save to ODF now, but I am not clear on why you would need
to. You might WANT to, but do you NEED to?