New IE knowledgebase articles
IE6: Error message when Internet Explorer 6 uses a DHTML Edit control: "R6052 pure virtual function call"
http://support.microsoft.com/default.aspx/kb/929068
When you open an Excel 2007 workbook by using Excel Web Access, you are presented with a Security Information dialog box (not yet live)
http://support.microsoft.com/default.aspx/kb/928729