"The 2007 R2 version of Microsoft® Office Communicator Mobile is an enterprise application for mobile devices that helps you quickly find and communicate with your colleagues. The application is designed to make communication easier and more accessible and includes real-time presence information, single number reach support and rich instant messaging (IM) capability all with a familiar look and feel similar to the desktop version of Microsoft Office Communicator."
Those working in a Microsoft-centric shop may find that the newest version of Communicator Mobile to be a great asset. Those looking to truly take a vacation, however, may find it to be the most evil piece of software ever devised! Just kidding...