Microsoft Exchange Property Tags

Microsoft® Exchange defines a set of properties that are used by the Microsoft Exchange Server and the Microsoft Exchange Client. The Microsoft® Visual Basic® programmer may occasionally need to access some of these properties from a CDO application, so they are provided here in alphabetic and then in numeric order.

The Messaging Application Program Interface (MAPI) defines a set of properties that are independent of Microsoft Exchange. The CDO libraries define 32-bit type library constants for these predefined MAPI properties. For more information, see MAPI Property Tags.

The CDO libraries do not provide any type library constants for the Microsoft Exchange properties. If you need to access one of them, you should assign its hexadecimal or decimal value to a variable:

   PR_EMS_AB_EXTENSION_ATTRIBUTE_1 = &H802D001E 
 

Most of the string properties can also be used in the Unicode format. When you reference a property for Unicode, you should change its property type from &H001E to &H001F. For example, the standard property tag for PR_EMS_AB_EXTENSION_ATTRIBUTE_10 is &H8036001E, but if your application is using Unicode you should refer to this property with &H8036001F.

Note that CDO does not support access to properties of the following types:

• PT_CLSID, where the last four digits of the property tag are 0048
• PT_OBJECT, where the last four digits of the property tag are 000D

For more information on Microsoft Exchange properties, see the Microsoft Exchange Server Programmer's Reference in the "Database and Messaging Services" section of the Microsoft® Platform SDK.

The following table lists the Microsoft Exchange property tags in alphabetic order:

The following table lists the Microsoft Exchange property tags in numeric order: