Microsoft Exchange Online Plan 2

In-Place Hold
Use In-Place Hold to preserve deleted and edited mailbox items from users' primary mailboxes and In-Place Archives.

Unlimited storage
Take advantage of unlimited storage (100 GB of storage in the user's primary mailbox, plus unlimited storage in the user's In-Place Archive).

Hosted voicemail
Take advantage of hosted Unified Messaging services that provide call answering, a dial-in user interface, and company automated attendant capabilities.

Data loss prevention (DLP)
Control sensitive business data with built-in DLP policies based on regulatory standards such as PII and PCI, which help to identify, monitor, and protect sensitive data through deep content analysis.