As for document writing... I've mentions practical alternatives already. WHY are they sending you an OOXML file? Is it for collaboration? In which point, a Wiki is more than suitable as a replacement. Are they sending it for final consumption? A PDF file is good for documents where the layout must be faithfully preserved.
If you're documenting code and leaving the documentation in an SVN server, .doc documents are treated as binary and don't really get revision editing you'd like. Its better to document using Doxygen (which is much akin to HTML) than .doc in many cases.