Namespace: http://schemas.microsoft.com/exchange/services/2006/types

The MailboxStatisticsItemType complex type specifies a mailbox statistic.

 <xs:complexType name="MailboxStatisticsItemType" xmlns:xs="http://www.w3.org/2001/XMLSchema">
     <xs:element minOccurs="1" maxOccurs="1" name="MailboxId" type="xs:string"/>
     <xs:element minOccurs="1" maxOccurs="1" name="DisplayName" type="xs:string"/>
     <xs:element minOccurs="1" maxOccurs="1" name="ItemCount" type="xs:long"/>
     <xs:element minOccurs="1" maxOccurs="1" name="Size" type="xs:long"/>

MailboxId: An element of type string, as defined in [XMLSCHEMA2] section 3.2.1, that contains an identifier for the mailbox.

DisplayName: An element of type string that specifies the name of the mailbox.

ItemCount: An element of type long, as defined in [XMLSCHEMA2] section 3.3.16, that contains the total number of items in a search result.

Size: An element of type long that contains the size, in bytes, of the mailbox items returned from a search.