Preview property
Implementation
static PropertyDefinition Preview = new StringPropertyDefinition(
    XmlElementNames.Preview,
    _ConversationSchemaFieldUris.Preview,
    [PropertyDefinitionFlags.CanFind],
    ExchangeVersion.Exchange2013);static PropertyDefinition Preview = new StringPropertyDefinition(
    XmlElementNames.Preview,
    _ConversationSchemaFieldUris.Preview,
    [PropertyDefinitionFlags.CanFind],
    ExchangeVersion.Exchange2013);