The property gets a Boolean value that specifies whether the message has been read. This property is read-only.
Assembly: EWS (in EWS.dll)
This property is returned in a response that describes a message. This property cannot be set for a request. An error will occur if this property is set in a request.
You must set the IsReadSpecified property to true so that the property is serialized into the Simple Object Access Protocol (SOAP) request.