Latest build of Microsoft Office Communicator 2007 is available from here.
This update fixes the following issues:
951870 (http://support.microsoft.com/kb/951870/) Event IDs 8239 and 8206 are logged when you schedule and then cancel a meeting in Communicator 2007
949498 (http://support.microsoft.com/kb/949498/) Error message when a Communicator 2007 user sends a message that contains only Japanese characters to Communicator 2005 users: “<Username> cannot receive message in the format you used”
951871 (http://support.microsoft.com/kb/951871/) The presence status changes to Away for all Terminal Server users when an administrator locks the desktop or lets the screen saver run in Communicator 2007
951868 (http://support.microsoft.com/kb/951868/) Registry settings for certain protocols are overwritten, and Communicator 2007 becomes the default application for these protocols when you log on to Communicator 2007
Note This update now enforces HTTPS in High Security mode. Some services that previously worked by using HTTP will now be required to use HTTPS when they are in High Security mode. These services include the address book service, the custom tabs service, and the custom presence service.