這裏是MSDN reference link和相應的示例代碼:
private const string Email1EntryIdPropertyAccessor = "http://schemas.microsoft.com/mapi/id/{00062004-0000-0000-C000-000000000046}/80850102";
PropertyAccessor propertyAccessor = contactItem.PropertyAccessor;
object rawPropertyValue = propertyAccessor.GetProperty(Email1EntryIdPropertyAccessor);
string recipientEntryID = propertyAccessor.BinaryToString(rawPropertyValue);
Recipient recipient = contactItem.Application.Session.GetRecipientFromID(recipientEntryID);
if (null == recipient)
throw new InvalidOperationException();
bool wasResolved = recipient.Resolve();
if (!wasResolved)
throw new InvalidOperationException();
ExchangeUser exchangeUser = recipient.AddressEntry.GetExchangeUser();
string smtpAddress = exchangeUser.PrimarySmtpAddress;