Vault admins have had the ability to put an entire user account on hold to preserve messages in that account. Over the next few days we are releasing a feature that will give admins the ability to also have the option to target specific messages—for example, by date or with certain terms—for indefinite preservation in Vault.

Editions included: 
Google Apps for Business, Education, and Government

For more information:
https://support.google.com/vault/answer/4359587
https://support.google.com/vault/answer/2473591

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Source: Google Apps update alerts