It’s funny to read about security flaws especially when an article shows that popular preconceptions are usually wrong. Microsoft has managed to bring its Office 2010 suite to a very good state regarding security while Oracle inherited OpenOffice unwilling to further evolve it. LibreOffice is the new open source “branch”.
Read the whole analysis here: CERT/CC Blog: A Security Comparison: Microsoft Office vs. Oracle Openoffice. For a teaser look at the following chart: