transition: babyl to mbox

[peter hodgson]

since emacs 23, gnus is playing tricks with my saved emails; some of
the old babyl formatted "saving files" take new stuff, and some do
not;

A. is there any way to "create" 

  1. a new "mem/<rmail file>" for "saving" emails which will use the
now deprecated babyl format?

     from my gnus.el:
     (setq gnus-article-save-directory "/home/hodgson/mem/")
  
  2. a new gnus "split-methods" list entry whose emails will
"accommodate" (if that's the issue) the old format?

     here's my gnus.el:
     (setq nnmail-split-methods
     (list
         (list "mail.emacs" "^(To|Cc):.*help-gnu-emacs@gnu\\.org")

B. where can i read up on the transition away form babyl;

C. the idea of a file (babyl format) which acts like a directory,
always seemed to be a fine accessory; is there an alternative?
should i just give up and "convert" away from it?
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