Google Groups - Use Conversation History to archive your Group messages

If you’re a manager of a Google Group, you can turn on Conversation History to archive and manage your Group messages from the Google Groups interface.
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Step 1

Sign in to Google Groups.

Step 2

Click the name of a group.

Step 3

On the left, under Group Settings click General.

Step 4

Under Posting Policies, turn Conversation History on. Make sure to save your changes.

Step 5

Conversation history can be viewed under the Conversations header on the left.

Step 6

You will be able to review and manage Group messages as they come in from this view.