How can I get SMTP address to an organizer with EWS

Is that possible to get SMTP address to an organizer from a response when I have the item of the type CalendarItemType.  What I get is name of the mailbox by using       myCalendarItem.Organizer.Item.Name.ToString()

 I can’t see any property to get the SMTP address in VS 2005. When I try to get value of miCalendarItem.Organizer.Item.EmailAddress , the property is null.