Uploading office 2007 (docx) files to CRM

On the newsgroups I've been talking to some people about uploading Office 2007 files. This appears to be not working as expected. There is a hotfix available for this issue now. Note: this hotfix is not included the rollup 1 package. Look at this page for more information: http://support.microsoft.com/default.aspx/kb/929488