Although Microsoft stopped distribution and active development of their TMG product in December 2012, it remains supported until 2015. Some customers are already using TMG and at the moment there are vendors that still sell TMG 2010 as an appliance for which they will continue to offer support for a while to come. Therefore, it is useful to have a look at how you can configure the TMG to work with Exchange 2013.

Despite all the modifications to make the TMG work in combination with Exchange 2013, it will present the user with an Exchange 2010-based login form. If you do not want this, for example because your users find it confusing, you will either have to create a custom login form for the TMG or revert to using another reverse-proxy solution.