When backing up folders within the Exchange Public Folder tree via the Legacy (Brick-level) backup method, the backup job may fail with the following error:
The Exchange Server is not responding. Backup set canceled
On the Exchange server being backed up, the Backup Exec Remote Agent can be seen to be in a stopped state and an event ID 1000 is logged in the Application Event Log with the following error text:
Faulting application beremote.exe, version 12.0.1364.0, faulting module MAPIProv.dll, version 12.0.1364.0, fault address 0x0000a485.
The cause of this problem can be traced to a specific folder or folders within the Public Folder tree causing the agent to crash. To identify the problem folder, open the latest Public Folder backup set within a Restore Job and look for the folder marked with the catalog symbol below:
Once the problem folder or folders have been identified, export their contents to a PST file using Microsoft Outlook and delete the original folder. Recreate the folder with its original name and import the data back into it from the PST file. A backup of the Public Folders should now succeed without the Remote Agent crashing.
If above steps do not resolve the issue,check the permissions on the Public Folder or subfolder found above causing Remote Agent to crash.Assign owner role on it explicitly as per below document