The chat history settings for Google Chat and classic Hangouts have been combined in the Google Admin console as follows:
- The settings on the chat history page apply to both Google Chat and classic Hangouts, regardless of which service you turn on or off.
- The default room history setting applies only to Google Chat (for unthreaded rooms).
If chat participants are in different organizational units, and you require different history settings for each, the chat conversation can’t be created. Chat conversations respect the settings for each organizational unit.