Publishing Exchange used to be easy. You installed Microsoft Security and Acceleration (ISA) Server or Forefront Threat Management Gateway (TMG) and considered your work done. But with the changes in roadmap of Microsoft security products such as TMG and UAG, and the addition of features like ARR and WAP, the sea of TLAs has become more complex than ever. Come and learn what the real risks are when publishing Exchange to the Internet, what your choices are, which you should choose, and how to deploy them. There's a TLA for everyone when it comes to publishing Exchange, but make sure you know which is which and which one you need, if at all. The Windows team have added an additional component called Application Request Routing 3.0 to the Internet Information Service (IIS) role, which enables IIS to handle reverse proxy requests and also perform layer seven Load Balancing of these requests.