"Users regularly cite lack of compatibility with Microsoft
Office files as a reason for not using OpenOffice.org.
OpenOffice.org does include Microsoft Office export filters, as
well as a number of settings for increased compatibility, but these
features provide only good, not complete, compatibility. For this
reason, Sun Microsystems' ODF Plugin for Microsoft Office, released
earlier this year, sounded like good news. Promising export and
import filters for Word, Excel, and PowerPoint, the free download
appeared to tackle compatibility from a new but promising angle by
giving Microsoft Office users the ability to open and save files in
Open Document Format, the default format for OpenOffice.org 2.0 and
higher. Unfortunately, the plugin is designed for older versions of
Windows and Microsoft Office. If you're using the increasingly
ubiquitous Vista and Microsoft Office 2007, the plugin delivers
only a fraction of what it promises..."