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 Lync. The
following table compares the two standalone plans, or you can compare the Office 365 options.
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Exchange Online Plan 1
Exchange Online Plan 2
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 copies 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
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
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.
In-Place Hold:Use In-Place Hold to preserve deleted and edited mailbox
items from users’ primary mailboxes and In-Place Archives.
Unlimited storage: 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).
Hosted voice mail: Take advantage of hosted Unified Messaging services that
provide call answering, a dial-in user interface, and company automated
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.