Exchange Online is part of the Microsoft 365 and Office 365 suite of products. 

 

Exchange Online Essential Exchange Online Plan 1 Exchange Online Plan 2
Storage size Mailbox storage per user with Exchange Online Each user gets 50 GB of mailbox storage and can send messages up to 150 MB in size Each user gets 100 GB of mailbox storage and can send messages up to 150 MB in size
Outlook support Users can connect supported copies of Outlook to Exchange Online, so they can use the rich client application they already know. Users can connect supported copies of Outlook to Exchange Online, so they can use the rich client application they already know. Take advantage of unlimited storage (100 GB of storage in the user's primary mailbox, plus unlimited storage in the user's In-Place Archive)
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 For web-client access, Outlook Web App provides a premium browser-based experience that matches the look and feel of the full Outlook client Take advantage of hosted Unified Messaging services that provide call answering, a dial-in user interface, and company automated attendant capabilities
Mobility Mobile access is available from all phones that can receive email, including Windows Phone, iPhone, Android, and Blackberry devices The Focused Inbox makes it easy to track email that matters most. Your inbox includes two tabs: Focused, for email you need to act on right away, and Other, for everything else. You can switch the tabs at any time and always see email flowing into Other Control sensitive business data with built-in data loss prevention (DLP) policies based on regulatory standards such as personally identifiable information (PII) and payment card industry (PCI), which help to identify, monitor, and protect sensitive data through deep content analysis
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 Compare calendars to schedule meetings and 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. Every mailbox is protected with premier anti-malware and anti-spam protection via Exchange Online Protection
Security Every mailbox is protected with premier antimalware and anti-spam protection via Exchange Online Protection. Keep your inbox clean by automatically moving old messages to an In-Place Archive
Community and phone support IT-level web support and 24/7 phone support for critical issues.
Guaranteed 99.9% up-time Get peace of mind knowing your services are available with a guaranteed 99.9% up time, and financially backed service level agreement (SLA).
Mail Control Monitoring the mail communication of users both internal and external communication.

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