Microsoft Exchange Online (Plan 1) helps businesses to maintain control over their environment while gaining the advantage of hosting email on Microsoft servers.
Microsoft Exchange Online (Plan 2) includes all the features of Exchange Online (Plan 1), plus unlimited storage, hosted voicemail, and data loss prevention.
Microsoft Exchange Online Archiving for Exchange Server provides a cloud-based archive for users with primary mailboxes in Exchange Server 2013 or Exchange 2010 (SP2 or later).
Microsoft Exchange Online Kiosk is a convenient email solution for workers without a desk or office or those who share a computer.
Microsoft Exchange Online Protection provides a layer of protection features that are deployed across a global network of datacenters, helping organizations simplify the administration of their messaging environments.