Security, Archival and Continuity are the three building blocks when looking at Mimecast.
Email threat detection for Office365 and Conventional Exchange Environments safeguards client networks.
Archival retention policies for regulatory and legal compliance to departments, groups and even individual mailboxes is essential.
Continuity features allow mail to be directly rerouted to client workstations should their Exchange Server or Office365 Portal be unavailable.
In short, Making Email safer for business!