| Large mailboxes: Each user gets 25 GB of mailbox storage and can send messages up to 25 MB in size. |
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| Outlook support: Users can connect supported copies of Outlook to Exchange Online, so they can use the rich client application they already know. |
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| 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. |
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| Mobility: Mobile access is available from all phones that can receive email, including Windows Phone, iPhone, Android, and Blackberry devices. |
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| 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. |
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| 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. |
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| Security: Every mailbox is protected with premier anti-malware and anti-spam protection via Exchange Online Protection. |
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| In-Place Archive: Reduce inbox clutter by automatically moving old messages to an In-Place Archive. |
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| In-Place Hold: Use In-Place Hold to preserve deleted and edited mailbox items from users' primary mailboxes and In-Place Archives. |
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| Unlimited storage: Take advantage of unlimited storage (25 GB of storage in the user's primary mailbox, plus unlimited storage in the user's In-Place Archive). |
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| Hosted voice mail: Take advantage of hosted Unified Messaging services that provide call answering, a dial-in user interface, and company automated attendant capabilities. |
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| Data Loss Prevention (DLP): Control sensitive business data with built-in DLP policies based on regulatory standards such as PII and PCI, which help to identify, monitor, and protect sensitive data through deep content analysis. |
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