Place a Microsoft Teams user or team on legal hold
When a reasonable expectation of litigation exists, organizations are required to preserve electronically stored information (ESI), including Teams chat messages that are relevant to the case. Organizations may need to preserve all messages related to a specific topic or for certain individuals. This article will cover legal hold in Microsoft Teams. To hold content across Microsoft 365, see Create an eDiscovery hold.
In February 2020, we turned on legal hold for private channels. Private channel chats are stored in user mailboxes, while normal channel chats are stored in the Teams’ group mailbox. If there is already a legal hold in place for a user mailbox, the hold policy will now automatically apply to private channel messages stored in that mailbox. There is no further action needed for an admin to turn this on. Legal hold of files shared in private channels is also supported.
Within Microsoft Teams, an entire team or select users can be put on legal hold. Doing that will make sure that all messages that were exchanged in those teams (including private channels) or messages exchanged by those individuals are discoverable by the organization's compliance managers or Teams Admins.
Placing a user on hold does not automatically place a group on hold or vice-versa. Notifications sent in activity feed can't be placed on hold.
To put a user or a team on legal hold in a Core eDiscovery case:
Go to the Microsoft 365 compliance center. When you create a new case, you are presented with the option to place mailboxes or sites on hold.
Go to eDiscovery > Core and create a case by clicking Create a case. After the case is created, open it.
You can also place a user on a hold that's associated with an Advanced eDiscovery case. For more information, see Manage holds in Advanced eDiscovery.
Go to the Holds tab on the top menu and click Create to create a hold. Placing a user or a team on hold preserves all the messages exchanged by those users or messages. When you create a new case, you are presented with the option to place mailboxes or sites on hold.
Name your hold. Select a descriptive and unique name for the hold you are going to create.
Choose location. Choose whether you want the hold to be applied on a user or on an entire Team (hold cannot be applied on individual channels for now). Note: if a user is on hold, all their messages would be on hold, including whatever they sent in a 1:1 chat, 1:many or group chat, or a channel conversation (including private channels).
Create query. You can customize the hold if you want more granularity in the hold policy. For example, you can specify keywords to look for, or you can add more conditions, that would need to be satisfied for the hold to take effect.
Review your settings before creating the hold.
After the legal hold has been created, you can search the content retained by any hold policy. For more information, see Conduct an eDiscovery investigation in Teams.
When a user or group is placed on hold, all message copies will be retained. For example, if a user posted a message in a channel and then modified the message, in a hold scenario, both copies of the message are retained. Without the legal hold in-place, only the latest message is retained.
Content locations to place on legal hold to preserve Teams content
As a helpful guide, you can use the following table to understand what content location (such as a mailbox or site) to place on legal hold to preserve different types of Teams content.
|Teams chats for a user (for example, 1:1 chats, 1:N group chats, and private channel conversations)||User mailbox.|
|Teams channel chats (excluding private channels)||Group mailbox used for the team.|
|Teams file content (for example, Wiki content and files)||SharePoint site used by the team.|
|Teams private channel files||Dedicated SharePoint site for private channels.|
|User's private content||The user's OneDrive for Business account.|
|Card content in chats||User mailbox for 1:1 chats, 1:N group chats, and private channel conversations or group mailbox for card content in channel messages. For more information, see the "Preserve card content" section in Create an eDiscovery hold.|
To retain communication in private channels, you need to put the user mailboxes ( Private channel users) on hold and when using eDiscovery tool to search, you should search in that user’s mailbox. As was stated earlier, private channel chats are stored in user mailboxes, not in group mailbox of a Team.
If you want to read further on this topic for non-Teams areas in Microsoft 365, you should review Manage eDiscovery cases: Place content locations on hold.