We use Exchange 2000 conferencing server to assist users from anywhere via the Internet to share their desktop and work with them interactively. The latest Active X patch KB912812 has broken all connections via IE to the conferencing server. If we uninstall the patch from end-users desktops everything starts to work again. The compatibility patch did not help. Strange that a MS patch broke an MS product but I guess someone missed this one during the pre-release testing.