Microsoft has just released two security advisories

• Microsoft Security Advisory (927891) - Fix for Windows Installer (MSI)
• Microsoft Security Advisory (937696) - Release of Microsoft Office Isolated Conversion Environment (MOICE) and File Block Functionality for Microsoft Office

The first actually states that does not address a security vulnerability,it provides a fix for Windows installer.  The second one is a conversion tool for office 2003  to convert documents to the new xml format used by  2007 and a file block utility.   The details are in the respective advisory.  There is also an entry on the msrc blog with more information on MOICE.