Data Loss Prevention (DLP) in Office 365 continues to evolve and expand as the platform matures. We’ve covered some of the upcoming improvements (New Data Loss Prevention capabilities in Office 365), but if you need to view or edit an existing policy, you can do so via the Exchange admin center.

Follow these steps:

1. From the admin center dashboard, navigate to the Exchange admin center.
2. Select compliance management.
3. Select data loss prevention.
4. To edit or view more about an existing policy, select it and double-click to open.
5. In the general section, view or edit the title, description, state, and enforcement method of the policy.
6. In the rules section, select an individual rule and click on the pencil icon to edit or view the details of the rule. For example, you could add custom disclaimer text to messages detected to have sensitive information.

For more information on DLP, including instructions on creatinng DLP policies and Policy Tips, see the Data loss prevention Technet page.