Sussed it, make a correspond folder in the network drive (which I have done) then copy the 100gig or so of correspondence from the AM server machine to a usb drive (copying over the network would take too long) everyone has to be out of AM so I have to do this in the evening. Then copy it to the new folder and map everyone to the new drive for correspondence only, again everyone has to be out of AM whilst this is done, its gonna take a bit of planning because I cannot let anyone use AM between taking it off one machine and putting it on the server, and I cannot let anyone use AM whilst copying it to the USB so it has to be done outside working hours