When running an Active Directory synchronization you receive the following message:
The directory is being synchronized by another user
Known to apply to the following Sophos product(s) and version(s)
SafeGuard Management Center / Local Policy Editor
What To Do
You must cancel the Active Directory synchronization which was started during another session on a separate SafeGuard Management Center or with a synchronization script.
To do this, go to the "Options" section of the Management Center, and click 'Reset import flag'.