Microsoft Office Isolated Conversion Environment

Below is a link to a KB article concerning the issue of Microsoft’s Office Isolated Conversion Environment for Office.  MOICE uses the 2007 Microsoft Office system converters to convert the Office binary format files into the Office Open XML format. This process helps remove the potential threat that may exist if the document is opened in the binary format. Additionally, MOICE converts incoming files in an isolated environment.

http://support.microsoft.com/kb/935865