PidTagConversationKey Canonical Property

Applies to: Outlook 2013 | Outlook 2016

Contains the conversation key used in Microsoft Outlook only when locating IPM.MessageManager messages, such as the message that contains download history for a Post Office Protocol (POP3) account. This property has been deprecated in Microsoft Exchange Server.

Associated properties:
Data type:
General messaging


When accessing email messages as conversations and converting message properties to Transport-Neutral Encapsulation Format (TNEF), do not use this property; instead, use the PidTagConversationIndex and PidTagConversationTopic canonical properties.

Protocol specifications


Provides references to related Microsoft Exchange Server protocol specifications.


Specifies the properties and operations that are permissible on email message objects.


Encodes and decodes message and attachment objects to an efficient stream representation.

Header files


Provides data type definitions.


Contains definitions of properties listed as alternate names.

See also

IPM Subtree

MAPI Special Folders

MAPI Properties

MAPI Canonical Properties

Mapping Canonical Property Names to MAPI Names

Mapping MAPI Names to Canonical Property Names