EWS implements new functionality in new product releases. Use the information in this article to determine whether the version of Exchange you're targeting includes support for the data or features you need access to.
The following table lists the versions of Exchange that include EWS and the major features that were introduced in each version.
EWS features by product version
Product version
Features
Office 365 and Exchange Online
Includes all the features in the current version of Exchange in addition to any new features that are added for online clients.
Exchange 2013 SP1
Includes all features introduced in Exchange 2013. The following features were introduced in Exchange 2013 SP1:
Read receipts can now be suspended for updates and deletions.
Conversations have a setting to indicate whether they contain email messages that are protected by IRM.
Meeting attendees can propose new start and end times for meetings and include them in their meeting response.
The SOAP Autodiscover GetUserSettings method now returns the GroupingInformation setting that is used maintain affinity for a multiple mailbox event subscription.
Exchange 2013
Includes all features introduced in Exchange 2010 SP2. The following features were introduced in Exchange 2013:
Archiving
eDiscovery
Personas
Retention policies
Unified Contact Store
User photos
Exchange 2010 SP2
Includes all the features introduced in Exchange 2010 SP1. The following features were introduced in Exchange 2010 SP2:
Get Password Expiration
DateTime precision
Updated property identifiers for contacts
New impersonation scenarios
Exchange 2010 SP1
Includes all the features introduced in Exchange 2010. The following features were introduced in Exchange 2010 SP1:
Create, retrieve and modify Inbox rules
Programmatic access to Archive Mailbox
Conversations actions
Firewall traversing notifications
Improved administration features
Improved mixed version support
Throttling protection support
Control of application access to EWS
Client certificate authentication support
Exchange 2010
Includes all features introduced in Exchange 2007 SP1. The following features were introduced in the initial release version of Exchange 2010:
Full Private Distribution List
User Configuration Objects
Folder Associated Items
Message tracking
Unified Messaging
SOAP Autodiscover
Enhanced Time Zone support
Room resource availability information
Indexed search
Dumpster access
MailTips information
Exchange 2007 SP1
Includes all the features introduced in Exchange 2007. The following features were introduced in Exchange 2007 SP1:
Delegate management
Folder permissions
Public folders
Post items
ID conversion
Exchange 2007
The following features were introduced in the initial release version of Exchange 2007:
Full access to items, folders, and attachments (Create, Get, Update, Delete)