Exchange Online is available as a standalone service or you can get it as part of an Office 365 plan that includes Office, SharePoint, and Skype for Business. The following table compares the two standalone plans, or you can compare the Office 365 options.
Each user gets 50 GB of mailbox storage and can send messages up to 150 MB in size.
Users can connect supported versions of Outlook to Exchange Online, so they can use the rich client application they already know.
For web-client access, Outlook on the web provides a premium browser-based experience that matches the look and feel of the full Outlook client.
Get more done on your phone and tablet with the Outlook app for iOS and Android.
Stay focused on the most important messages with Clutter, which applies machine learning to clean up your inbox and set up rules that match the way you work.
Save attachments directly to OneDrive for Business with just one click and share the link to the file—right from Outlook on the web.
Simplify collaboration with Office 365 Groups, which lets teams self-organize, work together across tools and devices, and build upon the expertise of others.
Shared calendar and contacts
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.
Third-party apps for Outlook
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 on the web.
Every mailbox is protected with premier anti-malware and anti-spam protection via Exchange Online Protection.
Keep your inbox clean by automatically moving old messages to an In-Place Archive.
Use In-Place Hold to preserve deleted and edited mailbox items from users' primary mailboxes and In-Place Archives.
Take advantage of unlimited storage (50 GB of storage in the user's primary mailbox, plus unlimited storage in the user's In-Place Archive).
Take advantage of hosted Unified Messaging services that provide call answering, a dial-in user interface, and company automated attendant capabilities.
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.