Default Exchange Store Namespaces

Topic Last Modified: 2006-06-12

The Exchange store defines and reserves the namespaces listed in the following table. These namespaces can be used in property names.

Namespace	Description
DAV: Namespace	Properties defined for the WebDAV protocol, including properties for general data access (such as the href Field) and for determining hierarchical information (such as the isfolder Field).
https://schemas.microsoft.com/exchange/ Namespace	Properties specific to Microsoft® Exchange Server 2007 and Exchange store.
https://schemas.microsoft.com/exchange/events/ Namespace	Properties used to create event sink binding items.
urn:schemas-microsoft-com:office:forms Namespace	Properties used to register HTML forms in the Exchange store.
https://schemas.microsoft.com/exchange/security/ Namespace	Properties specific to security features for items in the Exchange store.
urn:schemas-microsoft-com:datatypes Namespace	Definitions for data types used when creating schema items.
urn:schemas-microsoft-com:exch-data: Namespace	Definitions for Exchange-specific data types used for Exchange store properties.
urn:schemas-microsoft-com:xml-data Namespace	Definitions for XML namespaces that incorporate dynamic data typing and binding.
urn:schemas-microsoft-com:office:office Namespace	Properties specific to Microsoft Office files.
urn:schemas:calendar: Namespace	Properties used for calendaring. The following properties are also available for Collaboration Data Objects (CDO) calendar objects: Appointment CoClass, CalendarMessage CoClass, and Addressee CoClass.
urn:schemas:contacts: Namespace	Properties for managing contacts. Several properties are also available for the CDO Person CoClass object.
urn:schemas:httpmail: Namespace	Fields used to create and process the body of a message. For fields in the header of a message, use the mail header namespace.
urn:schemas:mailheader: Namespace	Standard mail header properties for messages. Several properties are also available for the CDO Message CoClass object.

When adding your own properties to items, you use your own namespace Uniform Resource Identifier (URI) in the property name to make each one unique.