New integrated archiving and discovery capabilities.

New unified mailbox resilience model that provides high availability, disaster recovery, and back up capabilities.

Ability to easily delegate administration to specialized users, such the help desk or a compliance officer.

Comprehensive information protection capabilities—from e-mail moderation to automatic e-mail encryption.

The choice to run Exchange on-premises, as a service hosted by Microsoft or as a hybrid of both.

A consistent inbox, calendaring, and contacts experience across the PC, browser and phone.

Integrated conversation view bringing together information across all folders, inbox and sent and deleted items.

Ability to remove (or "mute") themselves from irrelevant conversations with the click of a button.

Text preview of voice mail messages in the inbox.

New Call Answering Rules to easily create customized voice mail rules, such as call transfer options.

Mail Tips to notify users about potential mistakes before they send e-mail.