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Written by Richard Quatier

My goal is to help your business by integrating processes that automate mundane tasks and simplify complex ones without breaking budgets.

Categories: Teams

Tags: Admin Impact

December 29, 2020

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Change to properties added to Teams chat messages saved in Exchange Online

From Microsoft Corporation

MC230096 · Published Dec 16, 2020

Message Summary

We’re making some changes to the properties that are included in Teams chat messages when they are added to Exchange Online mailboxes.

Note: if you are not using eDiscovery you can disregard this message.

Currently, when chat messages (including 1:1 chats and 1:N chats) are added to Exchange Online mailboxes, the following Azure Active Directory (Azure AD) properties are added as MAPI properties to each message:

  • DisplayName
  • EmailAddresses
  • Guid
  • LegacyExchangeDN
  • ObjectClass
  • PrimarySmtpAddress
  • RecipientDisplayType
  • RecipientType
  • RecipientTypeDetails
  • Sid
  • SimpleDisplayName

This process requires Teams to look up the value for each of these properties (in a separate call to Azure AD) for every participant of a chat. Many of these properties are legacy Exchange properties used for mail delivery but aren’t used for compliance purposes such as performing an eDiscovery search.

Additionally, this process is resource intensive and may impact the Teams service while Exchange is looking up each of these properties for each chat participant in separate calls.

To address this issue, we are making a change so that only the DisplayName and PrimarySmtpAddress properties will be stamped on chat messages added to mailboxes for compliance purposes.

Key Points:

  • Timing: Begin in mid-December and complete by the end of January.
  • Action: Review and assess impact for your organization.

How this will affect your organization

You’ll still be able to use eDiscovery tools to search for chat messages by searching for chat participants, keywords, and other searchable email message properties.

Additionally, the properties that are no longer stamped on chat messages won’t be available to custom or third-party eDiscovery solutions. If your organization is using a custom or third-party eDiscovery solution you may need to make updates to account for this change.

What you need to do to prepare

Unless your organization is using a custom or third-party eDiscovery solution that uses any of the properties that are being removed, your organization doesn’t have to prepare for this change. This change will not affect chat messages that were added to mailboxes before the rollout.

Additional information about eDiscovery in Teams

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