We have a need to exclude a specific PST from Client Driven PST Migration. We set the Search Path exclusion in the PST policy but found the file was still being imported.
I logged case 07815680 and the outcome was that PST files open in the Outlook profile are always imported regardless of any search path exclusions.
A way to set the search path exclusion can overwrite the registry search for PST imports, or a way to stop the registry search altogether, would be good in future releases.