deprecated

deprecated adj.  Said of a program or feature that is
   considered obsolescent and in the process of being phased out,
   usually in favor of a specified replacement.  Deprecated features
   can, unfortunately, linger on for many years.  This term appears
   with distressing frequency in standards documents when the
   committees writing the documents realize that large amounts of
   extant (and presumably happily working) code depend on the
   feature(s) that have passed out of favor.  See also {dusty
   deck}.