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Acronis Backup & Recovery 10 cannot execute Windows PowerShell scripts as pre/post commands

Creating backups from MS Exchange using the Acronis Exchange Agent causes log entries in PowerShell. This can be solved by deleting the PowerShell subkey under Event Log in Windows Registry.

Upgrade to Microsoft Exchange 2010 SP1 can corrupt Windows PowerShell. However, PowerShell is required for Acronis Backup to work with Microsoft Exchange 2010 correctly. Use the instructions from the external sources provided in this article to repair Windows PowerShell.