I think cabber should be removed from the archive. The upstream website appears to be dead and has not been updated since 2004.
mcabber is a fork of cabber that is actively maintained. Maybe cabber could be changed to a transitional package on mcabber, but I do not know how compatible it is regarding user configuration files. -- To UNSUBSCRIBE, email to debian-wnpp-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org