FWIW, mail-extr.el as of Emacs 21 has this comment:
/----
| revision 1.25
| date: 1997/11/20 21:45:59; author: kwzh; state: Exp; lines: +714 -681
| (mail-extract-address-components):
| New arg ALL says return info about all the addresses.
| Clarify buffer switching logic using save-excursion.
\----
The most recent change has been on 2001-04-02. So it's not quite
dead, yet.
Not sure what to do about Emacs/XEmacs syncing.
kai
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