SearchableMailbox.IsMembershipGroup property

Gets or sets whether the associated SMTP address is a mailbox or distribution list.

The IsMembershipGroup property is applicable for clients that target Exchange Online and versions of Exchange starting with Exchange Server 2013.

Namespace:  Microsoft.Exchange.WebServices.Data
Assembly:  Microsoft.Exchange.WebServices (in Microsoft.Exchange.WebServices.dll)

public bool IsMembershipGroup { get; set; }

Property value

Type: System.Boolean
true if the associated SMTP address is a distribution list; otherwise, false.