Josh Condie - Exchange Server 2013 will be available next week, and comes with many new features as well as improvements on existing features that are already familiar to those who have worked with Exchange Server 2010.
In a nutshell:
This last one is a great one to understand, and may help distinguish on-premise deployments of Exchange 2013 from Cloud alternatives. DLP is increasingly important for enterprise messaging systems because business critical communications often include private and sensitive data that must be protected (which is often required by government regulation). Examples include financial information (account numbers), personally identifiable information (SSN, Drivers License) and intellectual property data, all of which can be mistakenly sent to unauthorized users. In order to protect these communications without affecting user productivity, the new version of Microsoft Exchange Server 2013 integrates DLP features so you can resolve sensitive data in email more easily than ever before.
3 different ways to get started with DLP in Exchange 2013:
Here are some more resources to educate and help you get started. DLP can be a real distinguishing service or solution for you customers, especially those in regulated industries like Finance, Health Care, Government, Education, etc.
Exchange Center on Technet: http://technet.microsoft.com/en-us/library/jj150527.aspx
Great Video Presentation and Demonstration: