Hangouts messages in Vault

If you are using Vault to archive history-on Hangouts messages, it may take up to thirty days for some chat messages to appear in your users’ Gmail inboxes and be available in Vault. This occurs approximately once in every 1,000 messages. Additionally, depending on your retention policies, there may be instances where these delayed messages are not inserted into the original conversation thread and therefore are not subject to thread-based protection.

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