Exchange 2010 contains some new features that make use of AD RMS technology. Exchange's Information Protection and Control topic highlights some of these features, including transport protections rules, Outlook protection rules, and IRM support in Outlook Web App:
Transport protection rules. when used with Active Directory Rights Management Services (AD RMS), transport protection rules enable an administrator to automatically apply Information Rights Management (IRM) protection to e-mail (including Office and XPS attachments) after a message is sent. This provides persistent protection to the file no matter where it is sent and prevents forwarding, copying, or printing depending on the set of AD RMS Policy Templates available from the AD RMS deployment. Voicemail can also be protected to prevent forwarding to unauthorized persons.
Outlook protection rules. These rules automatically trigger Outlook to apply an RMS template that is based on sender or recipient identities before a message is sent. With Outlook protection rules, administrators can also enable users to turn off protection for non-sensitive e-mail. Also, because the messages are protected at the desktop before they are sent out to Exchange, Outlook protection rules allow your organization to keep third-party service providers or onsite Exchange administrators from viewing sensitive content that is sent between your employees.
Support for IRM in Outlook Web App. Your users can read and reply to (as well as reply-all, forward, block print, cut/copy) IRM-protected messages natively, just as they would in Outlook. IRM-protected messages in Outlook Web App can be accessed through Windows Internet Explorer, Firefox, and Safari (no plug-ins required), and Outlook Web App includes full-text search, conversation view, and preview pane.