ConversationId property
Implementation
static PropertyDefinition ConversationId =
    new ComplexPropertyDefinition<complex.ConversationId>.withUriAndFlags(
        XmlElementNames.ConversationId,
        _ItemSchemaFieldUris.ConversationId,
        [PropertyDefinitionFlags.CanFind],
        ExchangeVersion.Exchange2010, () {
  return new complex.ConversationId();
});