Today, we released Office 2008 12.2.1. This release fixes issues where some users were unable to open some of their XML-based files in PowerPoint and Excel.
This issue was accidentally introduced when we introduced stronger checking of our new XML-based file formats. In short, we were looking for a particular XML tag, and some files were either missing this file or didn’t have it in the form that we were expecting. Most users didn’t see this issue, and for users who did see this issue, it usually wasn’t affecting all of their files.
Full Article – http://blogs.msdn.com/nadyne/archive/2009/08/06/office-2008-12-2-1-available-today.aspx
