Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-09-05

This section provides procedures related to recovering a failed database by performing a dial tone recovery on servers running Microsoft Exchange Server 2007. A dial tone recovery involves creating an empty database on a server to replace a failed database. This empty, or dial tone, database allows users to send and receive e-mail while the failed database is recovered. By using a dial tone recovery approach, you can restore basic e-mail service to users (providing them with a "dial tone") and then restore users' previous data as it becomes available.

This section provides information about several methods of performing a dial tone recovery:

All three methods use the following basic steps:

  1. Create a new empty dial tone database to replace the failed database   This new database will allow users who had mailboxes on the failed database to send and receive new messages. Exchange 2007 has a feature called dial tone portability that allows you to point a user to a different database without moving the mailbox. If you created the dial tone database on a different server than the server that housed the failed database, you will need to move the mailbox configuration to that new server. For more information about the dial tone portability feature, see Dial Tone Portability.

  2. Restore the old database   Use whatever backup and recovery software you typically use to restore the failed database. If there is no backup of the failed database, recover the failed database. If you are using the same server for dial tone recovery, you need to restore the database to a recovery storage group. For more information about recovery storage groups, see Understanding Recovery Storage Groups.

  3. Swap the dial tone with the restored database   After the failed database has been restored, swap it with the dial tone database. This gives the users the ability to send and receive e-mail and access all the data in the restored database. If users were moved to a dial tone database on another server, you then need to move the mailbox configuration back to the original server.

  4. Merge the databases   To get the data from the dial tone database into the restored database, merge the data. You can do this with the Database Recovery Management tool included in the Exchange Management Console. For more information about the Database Recovery Management tool, see Database Recovery Management and Database Troubleshooter Tools.

The methods have different advantages and disadvantages as follows:

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