Exchange Backup Fails With: "Failed to get folder properties. Not allowed to access Non IPM folder"
Challenge
A backup job in Veeam Backup for Microsoft 365 processing Exchange data fails with the error:
Failed to get folder properties. Not allowed to access Non IPM folder
Cause
During Exchange backup, Veeam Backup for Microsoft 365 requests the properties of all mailbox folders, including the properties of hidden and legacy folders (e.g., ‘TeamsMessagesData’).
Due to a recent change in Microsoft 365, the properties of the ‘TeamsMessagesData’ folder cannot be retrieved using the EWS APIs currently used by Veeam Backup for Microsoft 365.
Solution
To resolve this issue, configure Veeam Backup for Microsoft 365 to skip the ‘TeamsMessagesData’ folder.
- Ensure all backup jobs are stopped and no restore sessions are running.
- Stop the following services:
- Veeam Backup for Microsoft 365
- Veeam Backup Proxy for Microsoft 365
- Update the Config.xml file to skip the TeamsMessagesData folder.
- Open the folder: C:\ProgramData\Veeam\Backup365
- Within that folder, create a copy of Config.xml with the extension .old (i.e., Config.xml.old).
- Open the file 'C:\ProgramData\Veeam\Backup365\Config.xml' using any text editor as Administrator.
- Add the following line under the <Archiver> node and save the file.
Example:
<Veeam> <Archiver> <Proxy SkipTeamsMessagesDataFolders="True" />
Do not modify or remove any other lines within the Config.xml file.
- Start the services stopped in Step 2.
- Rerun the Exchange backup job.
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