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Data Loss Prevention (DLP) is a new feature area that helps you both protect sensitive data and inform users of internal compliance policies. DLP features help you identify, monitor, and protect sensitive data through deep content analysis. Exchange Online offers built-in DLP policies based on regulatory standards such as personally identifiable information (PII) and payment card industry data security standards (PCI), and DLP is extensible to support other policies important to your business.
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Your users carry sensitive corporate information in their pockets every day. If one of them loses their mobile phone, your data can end up in the hands of another person. If one of your users loses their mobile phone, you can use the Exchange Administration Center (EAC) or the Exchange Management Shell to wipe their phone clean of all corporate and user information.
As an Office 365 customer, all mail sent to your organization passes through Exchange Online Protection (EOP) prior to reaching your mailboxes. This ensures that spam doesn't reach your users. If you host all of your mailboxes in the cloud with Exchange Online, mail reaches your mailboxes after passing through EOP processing. In the same manner, if you sign up for EOP and continue to host your mailboxes on premises (called a standalone scenario), perhaps to continue taking advantage of your existing infrastructure, mail passes through EOP for processing and is routed on-premises for delivery. For outbound delivery, the process works in reverse.