Is it possible to create table spaces / partitions for the mail and news bases?

The mail file is very large, about 2 GB (I'm in the process of archiving) so as it is I have to run Contig on the Turnpike folder a few times a day. Turnpike still crashes though. I can't see where to change the default storage location.
Perhaps I need to create a partition for the whole Turnpike folder.

There's nothing built into windows for setting a space for a particiular app is there?