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PidTagAttachNumber Canonical Property

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Contains a number that uniquely identifies the attachment within its parent message.

Associated properties:

PR_ATTACH_NUM

Identifier:

0x0E21

Data type:

PT_LONG

Area:

Message attachment

Message stores generate and maintain this property. The attachment number is the secondary sort key, after the rendering position, in the attachment table.

PR_ATTACH_NUM is used to open the attachment with the IMessage::OpenAttach method. Within a client application's session, the PR_ATTACH_NUM property of a message attachment remains constant as long as the attachment table is open.

The message store propagates changes to the table using the IMessage::CreateAttach and IMessage::DeleteAttach methods. At its option the message store can generate table notifications on open attachment tables so that clients can resynchronize to those changes.

Protocol Specifications

[MS-OXCMSG]

Handles message and attachment objects.

Header Files

Mapidefs.h

Provides data type definitions.

Mapitags.h

Contains definitions of properties listed as alternate names.

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