Document ID: 325367
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Unable to attach errors can occur because of options and limitations with restoring Exchange 2003 backups to Exchange 2007 servers
Exact Error Message
<0xe000848c> - Unable to attach to a resource. Make sure that all selected resources exist and are online, and then try again.

Details:
Current limitations for restoring Exchange 2003 backups to Exchange 2007:

1.  Exchange 2003 database backups can not be restored to an Exchange 2007 server
This is due to a Microsoft Exchange limitation.  Please refer to Microsoft article  http://technet.microsoft.com/en-us/library/bb124039.aspx :

The Exchange 2007 RSG also does not support mounting mailbox databases from previous versions of Exchange Server.

2.  Exchange 2003 mailboxes can not be restored to an Exchange 2007 server

3.  Restoring individual mailbox items from an Exchange 2003 server backup to an Exchange 2007 server is currently not supported by Symantec.

    Note: While this operation is not officially supported by Symantec, some customers have reported success performing this type of restore.


Supplemental Material:

System: Ref.#Description
Error Code: 0xe000848c Unable to attach to a resource. Make sure that all selected resources exist and are online, and then try again. If the server or resource no longer exists, remove it from the selection list.

Acknowledgements
Microsoft: http://technet.microsoft.com/en-us/library/bb124039.aspx
Products Applied:
 Backup Exec for Windows Servers 11d (11.0), 12.0, 12.5
Last Updated: June 24 2009 04:05 PM GMT
Expires on: 06-24-2010
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Subjects:
 Backup Exec for Windows Servers
   Agent For Exchange: Backup-Restore, Troubleshoot
   Application: How To, Restore

Languages:
 English (US)

Operating Systems:
Windows Server 2003

R2, Standard Server