Google Message Continuity is a disaster recovery solution for Microsoft® Exchange provided by Postini and Google Apps. Message Continuity enables you to use Gmail as a backup mail server during planned and unplanned outages. Message Continuity delivers your organization's messages to both your primary mail server and to Gmail, which helps your organization maintain access to up-to-date emails when Exchange is down.

At the end of an outage, all changes made by users via Gmail are synchronized with the primary mail server. This includes messages sent from Gmail to other users, new messages received by users during the downtime, messages marked as read or starred, and changes to folders and labels.