Having installed Exch SP2 I thought I'd start using IMF and have turned it on per readme's etc. Other servers I look after IMF seemes to be working ok. However on one server I find that the Mailroot/vs1/UseArchive folder was not created and I have manually created it. Now I have a warning in the event log as follows (somewhat precied) -: MSExchangeTransport event id 7515. An error occurred while Microsoft Exchange IMF attempted to filter a message with the id hex etc From / To etc. This message will not be filtered. The error code is 0x800710f0. Can anyone point me in the direction to troubleshoot as I'd like to make best use of IMF. I did restart the IS after implementing IMF. Thanks Simon