Exchange Online Service Description

Are you looking for a feature comparison of Office 365 subscriptions that include Exchange Online? If so, the Exchange Online service description article is what you need. You'll also learn about system requirements as well as storage and recipient requirements.

Note

If you need assistance with a task, or if you are troubleshooting a problem, you might find the following articles helpful: > Email for help creating and sending email. > Email in Office 365 for business - Admin Help> Fix Outlook and Office 365 problems with Microsoft Support and Recovery Assistant for Office 365> Email non-delivery reports in Office 365> Exchange Online Help

Microsoft Exchange Online is a hosted messaging solution that delivers the capabilities of Microsoft Exchange Server as a cloud-based service. It gives users access to email, calendar, contacts, and tasks from PCs, the web, and mobile devices. It integrates fully with Active Directory, enabling administrators to use group policies, as well as other administration tools, to manage Exchange Online features across their environment.

Organizations that subscribe to Exchange Online retain control over the messaging services they offer to users, but they do not have the operational burden of on-premises server software. With the Exchange Online hosted plans described in this document, email is hosted on servers that support multiple customers simultaneously. These servers are housed in Microsoft data centers and are accessible to users on a wide range of devices from inside a corporate network or over the Internet.

To compare features across plans, see Compare Office 365 for Business plans. To compare plans for Office 365 Germany, see Office 365 Germany subscription plans.

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What's new in Exchange Online

For information about new features in Exchange Online, see What's New in Exchange Online.

Office 365 plans for Exchange Online

Office 365 is available in a variety of plans to best meet the needs of your organization. For information about different plans, including standalone plan options and information on moving from one plan to another, see Office 365 Plan Options.

Each user who accesses the Exchange Online service must be assigned to a subscription plan, and each user subscription has its own mailbox. Folders and messages in these mailboxes reside on a computer running Exchange Server at a Microsoft data center.

User subscriptions are not required for conference rooms and shared mailboxes. These special mailbox types do not have login credentials. Instead, licensed users with the appropriate permissions manage and access them via delegation.

System requirements for Exchange Online

For system requirements for Office 365, the monthly subscription-based service available for business, education, and government organizations, please see Office 365 system requirements.

Storage and Recipient Limits for Exchange Online

For information about the storage and recipient limits available in the Exchange Online subscription plans, see Exchange Online Limits.

Feature availability across Office 365 plans

If your organization currently has subscriptions to Office 365 Small Business, Office 365 Small Business Premium, or Office 365 Midsize Business, visit your Message Center in the Office 365 admin center or talk to your Office 365 provider for more details on how the new Office 365 Business plans impact you. To learn more about the new Office 365 Business plan family, see New Office 365 plans for small and mid-sized businesses.

Feature
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Planning and Deployment
Hybrid deployment supported
Yes
Yes
Yes16
Yes16
Yes
Yes
Yes
Yes16
IMAP migration supported
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Cutover migration supported
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Staged migration supported
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Permissions
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Role-Based Permissions
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Role Groups
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Role Assignment Policies
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Message Policy and Compliance
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Archiving Exchange Online-based Mailboxes
No
No
Yes
Yes
Yes
Yes
Yes
No
Cloud-Based Archiving of On-Premises Mailboxes
Yes 1
Yes1
No
No
Yes
Yes
Yes
No
Messaging Records Management (MRM) Retention Tags and Retention Policies
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Encryption of data at rest (BitLocker)
Yes15
Yes15
Yes
Yes
Yes
Yes
Yes
Yes
IRM using Azure Information Protection
No
Yes
No2
No2
No2
Yes
Yes
No2
IRM using Windows Server AD RMS
Yes3
Yes3
Yes3
Yes3
Yes3
Yes3
Yes3
Yes3
Office 365 Message Encryption
Yes13
Yes13
No2
No2
No2
Yes
Yes
No2
Customer Key for Office 36522
No
No
No
No
No
No
Yes
No
S/MIME
Yes15
Yes15
Yes
Yes
Yes
Yes
Yes
Yes
In-Place Hold and Litigation Hold
Yes
Yes
No
No
No
Yes
Yes
No
In-Place eDiscovery
Yes20
Yes20
Yes20
Yes20
Yes20
Yes20
Yes20
Yes
Transport Rules
Yes 4
Yes4
Yes4
Yes4
Yes4
Yes4
Yes4
Yes4
Data Loss Prevention
Yes5, 14
Yes5, 14
No
No
No
Yes
Yes
No
Journaling
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Anti-Spam and Anti-Malware Protection
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Built-In Anti-Spam Protection
Yes 6
Yes 6
Yes
Yes
Yes
Yes
Yes
Yes
Customize Anti-Spam Policies
Yes, but only via PowerShell
Yes, but only via PowerShell
Yes
Yes
Yes
Yes
Yes
Yes 7
Built-In Anti-Malware Protection
Yes 8
Yes 8
Yes8
Yes8
Yes8
Yes8
Yes8
Yes8
Customize Anti-Malware Policies
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes 7
Quarantine - administrator management
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes 7
Quarantine - end-user self-management
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Advanced Threat Protection
No
Yes
No
No
No
No
Yes
No
Mail Flow
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Custom Routing of Outbound Mail
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Secure Messaging with a Trusted Partner
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Conditional Mail Routing
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Adding a Partner to an Inbound Safe List
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Hybrid Email Routing
Yes
Yes
Yes16
Yes16
Yes
Yes
Yes
Yes
Recipients
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Capacity Alerts
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Clutter
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
MailTips
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Delegate Access
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Inbox Rules
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Connected Accounts
Yes
Yes
Yes
Yes
Yes17
Yes17
Yes17
Yes17
Inactive Mailboxes
No
No
No9
No9
No9
Yes
Yes
No 9
Offline Address Book
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Address Book Policies
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Hierarchical Address Book
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Address Lists and Global Address List
Yes
Yes
Yes
Yes
Yes18
Yes18
Yes18
Yes18
Office 365 Groups
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Distribution Groups
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
External Contacts (global)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Universal Contact Card
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Contact Linking with Social Networks
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Resource Mailboxes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Conference Room Management
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Out-of-Office Replies
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Calendar Sharing
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Reporting Features and Troubleshooting Tools
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Office 365 admin center reports
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Excel Reporting Workbook
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Web Services Reports
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Message Trace
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Auditing Reports
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes 3
Unified Messaging Reports
Yes
Yes
No
No
No
Yes
Yes
No
Sharing and Collaboration
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Federated Sharing (Including Calendar Publishing)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Site Mailboxes
Yes10
Yes10
Yes11
Yes11
Yes11
Yes11
Yes11
Yes11
Public Folders
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Clients and Mobile Devices
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Outlook for Windows 21
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Outlook on the web21
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Outlook for Mac21
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Outlook for iOS and Android21
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Exchange ActiveSync
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Mobile Device Management for Office 365
No
No
Yes
Yes
Yes
Yes
Yes
Yes
POP and IMAP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes 12
SMTP
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
EWS Application support
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Voice Message Services
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Voice Mail23
Yes
Yes
No
No
No
Yes
Yes
No
Integration Between Voice Mail and Third-Party FAX23
Yes
Yes
No
No
No
Yes
Yes
No
Third-Party Voice Mail Interoperability23
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Skype for Business Integration
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
High Availability and Business Continuity
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Mailbox Replication at Data Centers
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Deleted Mailbox Recovery
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Deleted Item Recovery
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Single Item Recovery
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Interoperability, Connectivity, and Compatibility
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Skype for Business Presence in OWA and Outlook
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
SharePoint Interoperability
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
EWS Connectivity Support
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
SMTP Relay Support
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Exchange Online Setup and Administration
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Microsoft Office 365 portal access
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Microsoft Office 365 admin center access
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Exchange admin center access
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Remote Windows PowerShell access
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
ActiveSync Policies for Mobile Devices
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Usage Reporting
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Extending the Service - Customization, Add-ins, and Resources
Exchange Server 2013
Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise E5
Office 365 Enterprise F1
Outlook Add-Ins and Outlook MAPI
Yes19
Yes
Yes19
Yes19
Yes19
Yes19
Yes19
No

Note

1 Requires an Exchange Online Archiving (EOA) subscription for each on-premises mailbox user that has a cloud-based archive.
2 Azure Information Protection is not included, but can be purchased as a separate add-on and will enable the supported Information Rights Management (IRM) features. Some Azure Information Protection features require a subscription to Office 365 ProPlus, which is not included with Office 365 Business Essentials, Office 365 Business Premium, Office 365 Enterprise E1, Office 365 Education, or Office 365 Enterprise F1.
3 Windows Server AD RMS is an on-premises server that must be purchased and managed separately in order to enable the supported IRM features.
4 Transport rules are made up of flexible criteria, which allow you to define conditions and exceptions, and actions to take based on the criteria. The available criteria and actions differ between Exchange Online, and Microsoft Exchange Server 2013. For a list of available criteria and actions, see the corresponding criteria and actions topics for each product.
5 For Exchange 2013, DLP requires an Exchange Enterprise Client Access License (CAL). For more information about CALs and server licensing, see Exchange Server Licensing.
6 Exchange Server 2013 has most of the same built-in anti-spam capabilities as Exchange Server 2010. For information about the benefits of Exchange hosted spam filtering over the on-premises offerings, see Benefits of Anti-Spam Features in Exchange Online Protection Over Exchange Server 2013.
7 Only accessible via direct access to the Exchange admin center (EAC) management interface.
8 Exchange Server 2013 uses only the Microsoft anti-malware engine. Exchange Online uses multiple anti-malware engines to scan inbound, outbound, and internal messages for malware.
9 An EOA subscription can be purchased separately for each mailbox that requires the inactive mailbox feature.
10 SharePoint must be deployed in the on-premises Exchange organization.
11 SharePoint Online must be included in the Office 365 subscription plan.
12 POP is supported, but IMAP is not.
13 Supported for Exchange Server 2013 on-premises customers who purchase Azure Information Protection. Office 365 Message Encryption requires on-premises customers to route email through Exchange Online, either by using Exchange Online Protection for email filtering, or by establishing hybrid mail flow.
14 Exchange Server 2013 customers need to download and install SP1 in order to access Document Fingerprinting and Policy Tips in OWA and OWA for Devices.
15 BitLocker Drive Encryption is supported for Exchange Server 2013, but an administrator needs to enable the feature.
16 Office 365 Business Essentials, Office 365 Business Premium, and Office 365 Enterprise F1 do not provide access rights for utilization with on-premises servers. To be compliant, customer must purchase or have previously purchased the appropriate CALs or upgrade to an Enterprise SKU that provides these access rights.
17 Connected accounts are supported for POP & IMAP accounts, but disabled for Outlook.com (Hotmail).
18 Using a cmdlet to work with the Address List and Global Address List is not supported.
19 Some third-party web parts and add-ins may not be available.
20 For eDiscovery, you need a separate query for on-premises vs. cloud.
21 Table indicates whether or not the client works with the associated plans. It does not mean the clients are necessarily included in the purchase of these plans.
22 For more information, see Controlling your data in Office 365 using Customer Key.
23 Exchange Online UM support for third-party PBX systems via direct connections from customer operated SBCs will end in April 2019. Please see the Exchange team blog Discontinuation of support for Session Border Controllers in Exchange Online Unified Messaging for more information.

Feature availability across Exchange Online standalone plans

Feature
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Planning and Deployment
Hybrid deployment supported
Yes
Yes
Yes
Yes
Yes23
IMAP migration supported
Yes
Yes
Yes
Yes
Yes
Cutover migration supported
Yes
Yes
Yes
Yes
Yes
Staged migration supported
No
No
Yes
Yes
Yes
Permissions
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Role-Based Permissions
Yes
Yes
Yes
Yes
No
Role Groups
Yes
Yes
Yes
Yes
No
Role Assignment Policies
Yes
Yes
Yes
Yes
No
Message Policy and Compliance
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Archiving Exchange Online-based Mailboxes
Yes
No
Yes
Yes
No
Cloud-Based Archiving of On-Premises Mailboxes
Yes 5
Yes 5
No
Yes
No
Messaging Records Management (MRM) Retention Tags and Retention Policies
Yes
Yes
Yes
Yes
Yes
Encryption of data at rest (BitLocker)
Yes16
Yes16
Yes
Yes
Yes
IRM using Azure Information Protection
No
Yes
No11
No11
No11
IRM using Windows Server AD RMS
Yes12
Yes12
Yes12
Yes12
Yes12
Office 365 Message Encryption
Yes13
Yes13
No11
No11
No11
S/MIME
Yes15
Yes15
Yes
Yes
Yes
In-Place Hold and Litigation Hold
Yes
Yes
No17
Yes
No
In-Place eDiscovery
Yes22
Yes22
Yes22
Yes22
Yes22
Transport Rules
Yes 1
Yes 1
Yes 1
Yes 1
Yes 1
Data Loss Prevention
Yes10, 14
Yes10, 14
No
Yes
No
Journaling
Yes
Yes
Yes
Yes
Yes
Anti-Spam and Anti-Malware Protection
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Built-In Anti-Spam Protection
Yes 2
Yes 2
Yes
Yes
Yes
Customize Anti-Spam Policies
Yes but only via PowerShell
Yes but only via PowerShell
Yes
Yes
Yes 8
Built-In Anti-Malware Protection
Yes 7
Yes 7
Yes7
Yes7
Yes7
Customize Anti-Malware Policies
Yes
Yes
Yes
Yes
Yes 8
Quarantine - administrator management
Yes
Yes
Yes
Yes
Yes 8
Quarantine - end-user self-management
No
No
Yes
Yes
Yes
Mail Flow
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Custom Routing of Outbound Mail
Yes
Yes
Yes
Yes
Yes
Secure Messaging with a Trusted Partner
Yes
Yes
Yes
Yes
Yes
Conditional Mail Routing
No
No
Yes
Yes
Yes
Adding a Partner to an Inbound Safe List
No
No
Yes
Yes
Yes
Hybrid Email Routing
Yes
Yes
Yes
Yes
Yes
Recipients
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Capacity Alerts
Yes
Yes
Yes
Yes
Yes
Clutter
No
No
Yes
Yes
Yes
MailTips
Yes
Yes
Yes
Yes
Yes
Delegate Access
Yes
Yes
Yes\
Yes
No
Inbox Rules
Yes
Yes
Yes
Yes
No
Connected Accounts
Yes
Yes
Yes19
Yes19
Yes19
Inactive Mailboxes
No
No
No 6
Yes
No 6
Offline Address Book
Yes
Yes
Yes
Yes
Yes
Address Book Policies
Yes
Yes
Yes
Yes
Yes
Hierarchical Address Book
Yes
Yes
Yes
Yes
No
Address Lists and Global Address List
Yes
Yes
Yes20
Yes20
Yes20
Office 365 Groups
No
No
Yes24
Yes24
No
Distribution Groups
Yes
Yes
Yes
Yes
Yes
External Contacts (global)
Yes
Yes
Yes
Yes
Yes
Universal Contact Card
Yes
Yes
Yes
Yes
Yes
Contact Linking with Social Networks
Yes
Yes
Yes
Yes
Yes
Resource Mailboxes
Yes
Yes
Yes
Yes
Yes
Conference Room Management
Yes
Yes
Yes
Yes
Yes
Out-of-Office Replies
Yes
Yes
Yes
Yes
Yes
Calendar Sharing
Yes
Yes
Yes
Yes
Yes 18
Reporting Features and Troubleshooting Tools
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Office 365 admin center reports
No
No
Yes
Yes
Yes
Excel Reporting Workbook
No
No
Yes
Yes
Yes
Web Services Reports
No
No
Yes
Yes
Yes
Message Trace
No
Yes
Yes
Yes
Yes 8
Auditing Reports
Yes
Yes
Yes
Yes
Yes 8
Unified Messaging Reports
Yes
Yes
No
Yes
No
Sharing and Collaboration
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Federated Sharing
Yes
Yes
Yes
Yes
Yes
Site Mailboxes
Yes 3
Yes 3
Yes 4
Yes 4
Yes 4
Public Folders
Yes
Yes
Yes
Yes
No
Clients and Mobile Devices
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Microsoft Outlook
Yes
Yes
Yes
Yes
No
Outlook Web App
Yes
Yes
Yes
Yes
Yes
Exchange ActiveSync
Yes
Yes
Yes
Yes
Yes
POP and IMAP
Yes
Yes
Yes
Yes
Yes 9
SMTP
Yes
Yes
Yes
Yes
Yes
EWS Application support
Yes
Yes
Yes
Yes
No
Outlook for Mac
Yes
Yes
Yes
Yes
No
Voice Message Services
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Voice Mail
Yes
Yes
No
Yes
No
Third-Party Voice Mail Interoperability
Yes
Yes
Yes
Yes
Yes
Skype for Business Integration
Yes
Yes
Yes
Yes
Yes
High Availability and Business Continuity
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Mailbox Replication at Data Centers
No
No
Yes
Yes
Yes
Deleted Mailbox Recovery
Yes
Yes
Yes
Yes
Yes
Deleted Item Recovery
Yes
Yes
Yes
Yes
Yes
Single Item Recovery
Yes
Yes
Yes
Yes
No
Interoperability, Connectivity, and Compatibility
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Skype for Business Presence in OWA and Outlook
Yes
Yes
Yes
Yes
Yes
SharePoint Interoperability
Yes
Yes
Yes
Yes
Yes
EWS Connectivity Support
Yes
Yes
Yes
Yes
Yes
SMTP Relay Support
Yes
Yes
Yes
Yes
Yes
Exchange Online Setup and Administration
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Microsoft Office 365 portal access
No
No
Yes
Yes
Yes
Microsoft Office 365 admin center access
No
No
Yes
Yes
Yes
Exchange admin center access
Yes
Yes
Yes
Yes
Yes 8
Remote Windows PowerShell access
Yes
Yes
Yes
Yes
Yes
ActiveSync Policies for Mobile Devices
Yes
Yes
Yes
Yes
Yes
Usage Reporting
Yes
Yes
Yes
Yes
Yes
Extending the Service - Customization, Add-ins, and Resources
Exchange Server 2013
Exchange Server 2016
Exchange Online Plan 1
Exchange Online Plan 2
Exchange Online Kiosk
Outlook Web App Web Parts
Yes
Yes
Yes
Yes
Yes
Outlook Add-Ins and Outlook MAPI
Yes
Yes
Yes21
Yes21
No

1 Transport rules are made up of flexible criteria, which allow you to define conditions and exceptions, and actions to take based on the criteria. The available criteria and actions differ between Exchange Online, and Microsoft Exchange Server 2013. For a list of available criteria and actions, see the corresponding criteria and actions topics for each product.
2 For information about the benefits of Exchange hosted spam filtering over the on-premises offerings, see Benefits of Anti-Spam Features in Exchange Online Protection Over Exchange Server 2013.
3 SharePoint must be deployed in the on-premises Exchange organization.
4 SharePoint Online must be included in the Office 365 subscription plan.
5 Requires an Exchange Online Archiving (EOA) subscription for each on-premises mailbox user that has a cloud-based archive.
6 An EOA subscription can be purchased separately for each mailbox that requires the inactive mailbox feature.
7 Exchange Server 2013 uses only the Microsoft anti-malware engine. Exchange Online uses multiple anti-malware engines to scan inbound, outbound, and internal messages for malware.
8 Only accessible via direct access to the Exchange admin center (EAC) management interface.
9 IMAP is not supported.
10 For Exchange 2013 or later, DLP requires an Exchange Enterprise Client Access License (CAL). For more information about CALs and server licensing, see Exchange Server Licensing.
11 Azure Information Protection is not included, but can be purchased as a separate add-on and will enable the supported Information Rights Management (IRM) features. Some Azure Information Protection features require a subscription to Office 365 ProPlus, which is not included with Office 365 Business Essentials, Office 365 Business Premium, Office 365 Enterprise E1, Office 365 Education, or Office 365 Enterprise F1. Office 365 Message Encryption depends on Azure Information Protection.
12 Windows Server AD RMS is an on-premises server that must be purchased and managed separately in order to enable the supported IRM features.
13 Supported for customers running Exchange Server 2013 or later who purchase Azure Information Protection. Office 365 Message Encryption requires on-premises customers to route email through Exchange Online, either by using Exchange Online Protection for email filtering, or by establishing hybrid mail flow.
14 Customers running Exchange Server 2013 or later need to download and install the latest cumulative update (CU), or the immediately previous CU, to access Document Fingerprinting and Policy Tips in OWA and OWA for Devices.
15 Available to customers running Exchange Server 2013 or later.
16 BitLocker Drive Encryption is supported for Exchange Server 2013, but an administrator needs to enable the feature. > 17 Exchange Online Plan 1 has a size limit on the mailbox and archive. Exchange Online Archiving for Exchange Online add-on adds unlimited cloud-based archive and In-Place Hold.
18 Exchange Online Kiosk calendars can only be accessed or shared through OWA.
19 Connected accounts are supported for POP & IMAP accounts, but disabled for Outlook.com (Hotmail).
20 Using a cmdlet to work with the Address List and Global Address List is not supported.
21 Some third-party web parts and add-ins may not be available.
22 For eDiscovery, you need a separate query for on-premise vs. cloud.
23 Exchange Online Kiosk does not provide access rights for utilization with on-premises servers. To be compliant, customer must purchase or have previously purchased the appropriate CALs or upgrade to an Enterprise SKU that provides these access rights.
24 Office 365 Groups is available with reduced functionality.