Re: are the change tracking features in ODF and DOCX compatible?
What do you mean by that? Compatible, how?
The software I use when dealing with MSOffice users can read and write ODF and DOCX, including change tracking features, so I can open a DOCX doc and save it as ODF and vice versa but that's a feature of the software not the documents. If what you want to do is copy/paste bits between the source XML, forget it: ODF is pretty clean but DOCX is a mess, trying to faff around with the source has always resulted in a corrupted document in my hands (Although I've only ever done it to try and get something from an already corrupted file so that may be the reason).