Review the following before restoring an Exchange Server 5.5:

• Restoring an Exchange Server 5.5 Directory Store to an Exchange Server other than the original is not supported; only Information Store data can be restored to a different computer.

• The Exchange System Attendant service must be running on the target server.

  If you are restoring Exchange data to more than one Windows computer, the System Attendant service must be running on each target computer.

• The target server must have access to the original Security Account Manager (SAM) information If you are restoring the Exchange Directory.

  If the recovered server does not have access to the SAM information from the original domain, and the Directory Store is restored, none of the Exchange data is accessible after the restore. This is because the Exchange Directory uses SID (Security Identifier) information for authenticating access to objects and the restored SID information will not match SID information from the SAM in the new domain.

• The Directory and Information Store services are stopped when the corresponding stores are restored. Users cannot access them until the restore is complete and the services are restarted.