Office365 Exchange Online Plan 1

Large mailboxes
Each user gets 50 GB of mailbox storage and can send messages up to 25 MB in size.

Outlook support
Users can connect supported versions of Outlook to Exchange Online, so they can use the rich client application they already know.

Web-based access
For web-client access, Outlook Web App provides a premium browser-based experience that matches the look and feel of the full Outlook client.

Mobility
Mobile access is available from all phones that can receive email, including Windows Phone, iPhone®, Android, and Blackberry devices.

Shared calendar and contacts
Users can compare calendars to schedule meetings and can access collaboration features, including shared calendars, groups, the global address list, external contacts, tasks, conference rooms, and delegation capabilities.

Apps for Outlook
Users can spend less time switching between apps with an extension model that allows third-party web applications easy plug-in access for both Outlook and Outlook Web App.

Security
Every mailbox is protected with premier anti-malware and anti-spam protection via Exchange Online Protection.

In-Place Archive
Reduce inbox clutter by automatically moving old messages to an In-Place Archive.