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Not sure that is part of the temp directories, but if it isn't, you could exclude with redirections.xml if it is a huge issue. However - my Search database rarely gets that big. I'd delete on logoff then monitor over time

I think this INetCache tree is specific to the Windows.Search servcice - has anyone else had any success using the resirections.xml to exclude this Windows.Search INetCache content?

If it's in INetCache it might be covered by the temp policy setting, definitely worth a try before faffing with redirections.xml