Deletes previous versions of QuickFinder .idx and .inc files to conserve disk space during periods of heavy indexing. In general, it is applicable for use only with /qflevel=1, where indexing activities are a lower priority task that user activities in their mailboxes. See Reclaiming Disk Space.
See also /qflevel, /qfnolibs, /qfnopreproc, /qfnousers, /qfusefidbeg, and /qfuserfidend.