BE 2010 - V-79-57344-33932 - Unable to attach to a resource on E2k3 server

Hi,

I have some troubles with backing up our Exchange Public Folders. We have a few calendars and few more contact list under Public Folder, everything seems to work properly. However my backup always fails with following error:

Backup- ASH-001Unable to attach to \\ASH-001\Microsoft Exchange Public Folders.
V-79-57344-33932 - 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. Edit the selection list properties, click the View Selection Details tab, and then remove the resource.

I can see in History List that BE has backed up 114GB of our Exchange server and all email boxes are properly backed up.

I spent hours searching forums, google etc but no luck:(

Can anyone help please?:)

 

Best regards
Luu