Chart summarizes differences among Web and mobile clients from Microsoft for Exchange Server and Exchange Online.
A new service tier for Office 365 Message Encryption enables organizations to set custom expiration dates for specific message types and enables administrators to revoke access to specific messages.
Office 365 Multi-Geo allows an organization to specify the region where each user's Office user data will be stored, at a small additional charge
In some cases, organizations will require more Exchange Online User SLs than they would have required Exchange Server CALs
An [online service that provides e-mail, calendars, contacts, and tasks; works with Outlook clients; licensed standalone or as part of suites via User SLs (Subscription Licenses).
