I know Microsoft Office 2003 and Microsoft Office 2007 have some incompatibility issues with LibreOffice. For example if I create a document in LibreOffice with doc format and try to open it in Office 2003/2007, the margin, tables and images might/will move a bit around.
Reading that Microsoft Office 2010 is "more compatible" are this issues resolved that when I create a doc or odt file, it will be correctly read in Office 2010.
Note that I say THEY have incompatibility issues. For what I have seen, the correct format is the one used in LibreOffice/OpenOffice and not the other way around. It is more standardized.
UPDATE - Would like to add that in 2 pages of Wikipedia, Microsoft Office 2010 is mentioned as having compatibility for version 1.1 of the ODF.
Because of this, I made the question just to be sure from experience of other LibreOffice users in Ubuntu.
UPDATE 2 - The European IT authorities have come up with several ideas to improve the OOXML compatibility in LibreOffice. they include all the problems I mentioned like images, macros, frames and such. More info here and here.
I want to also add that after LibreOffice 4.x, the compatibility level has risen. There is more compatibility between both office suite.