Veeam Backup for O365: failed to export item to .pst file

Short blog post as this error was tricky and costs some time…

Veeam Backup for O365 allows the export of selected items to a .pst file.

Usually this works like a charm. But recenty the export always stopped at 100 percent and the following error was displayed in the job status:

Failed to export item Veeam website registration completed (type: IPM.Note; source: … )

Resolution:

The reason for this behaviour was a registry key set by the domain admins:

HKEY_CURRENT_USER\Software\Policies\Microsoft\office\16.0\outlook\PST

PstDisbaleGrow = 1

This registry key is used to prevent users from adding new content to existing PST files.

It’s often used in combination with DisablePST = 1 to prevent users from adding PSTs to Outlook profiles and/or prevent using Sharing-Exclusive PSTs.

The resolution is to set this registry key to “0” at the affected system.

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