For schools, adding Google Apps Vault is affordable and easy.
Pricing is based on the number of faculty, staff, and administrator accounts; student accounts are covered for free.
But while Google Apps Vault for Education is purchased to cover all users on your Google Apps Domain, the admin settings do not provide this by default.
After your Google Apps Vault account is active, you need to go into the Admin console and set to auto enroll users. If not, only individually specified users will have the service.
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