A few weeks ago I got interviewed by RunAsRadio, who delivers weekly IT Pro podcasts.
The topic for my interview was Federation in Exchange 2010.
Information workers frequently need to collaborate with external recipients, vendors, partners, and customers and share their free/busy (also known as calendar availability) and contact information.
While federation has been around for a while in Exchange, the 2010 goes into a web services model that allows simple, limited visibility for other organizations Exchange 2010 users into your calendar and contacts. The trust is established based on the Microsoft Federation Gateway (a trust broker), which makes it easier for the admin guys to set it up.
Listen to the Podcast here: Peter Schmidt Federates Exchange 2010!
Read more about Exchange 2010 Federation on TechNet.