Yes, Google Vault supports classic Hangouts chat messages that are retained if chat history is turned on. The classic Hangouts chat retention policy governs all chats in Gmail and classic Hangouts chat.
- History-on (archived) classic Hangouts chat messages are retained according to the classic Hangouts chat holds and retention rules in Google Vault. Archived messages can be searched, exported, and placed on hold for eDiscovery purposes.
- Shortly after a retention period has expired, archived messages will be expunged from classic Hangouts chat, and a user's Gmail mailbox. They will no longer be searchable or exportable by Vault administrators or Vault users with the appropriate privileges.
Yes. Learn how to install classic Hangouts chat on all your devices.
If you want to use the photo-sharing functionality in classic Hangouts chat, you need to turn on the Google Photos service in your Admin console.
Note: Google Photos is an additional service that is not subject to the terms of your G Suite account agreement.