What is the OS version that you have installed on your 8800? There are two versions out for download right now. They are 22.214.171.124 and 126.96.36.199. The .72 is the Cingular version and the .73 is the O2 version, I believe. If you have either one of these then you can install the matching one, and then delete the vendor.xml file and you should be able to reinstall the Messenger using Desktop Manager. Delete the 1.0.94 version first.