Not many people are aware of this. But “Microsoft Office Communicator hotfixes are not part of Windows Update, so it is important to find and deploy them through other means.” (source) I’m completely baffled on how this happened. In the Mac Messenger version, the update is handled by the standard office update. Someone on the Windows side completely dropped the ball. And I’m willing to bet that there are a _lot_ of admins out there that don’t know that this is the case.