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diff --git a/misc/bbdb-unmigrate-stuff.el b/misc/bbdb-unmigrate-stuff.el
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+;;; -*- Mode:Emacs-Lisp -*-
+
+;;; This file is part of the Insidious Big Brother Database (aka BBDB),
+;;; Copyright (c) 2000 Alex Schroeder
+;;;
+;;; The Insidious Big Brother Database is free software; you can redistribute
+;;; it and/or modify it under the terms of the GNU General Public License as
+;;; published by the Free Software Foundation; either version 2, or (at your
+;;; option) any later version.
+;;;
+;;; BBDB is distributed in the hope that it will be useful, but WITHOUT ANY
+;;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+;;; FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+;;; details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Emacs; see the file COPYING.  If not, write to
+;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+(defun bbdb-unmigrate-stuff (&optional new-version)
+  "Create a buffer with unmigrated BBDB data.
+Usefull if you fooled around with BBDB file format 4 by Alex and want to
+start using the official BBDB 2.00.06 again.  In order to do that, you
+have to save your .bbdb in BBDB file format 3 instead of the file format 4
+introduced by Alex.  This function will create a *BBDB Version 3* buffer
+for you, which you can examine and save as your new .bbdb.  The unmigration
+will strip the country fields of all entries in your BBDB as such a field
+did not exist in the BBDB file format 3 used in BBDB 2.00.06."
+  (interactive "nUnmigrate to version (I recommend version 3): ")
+  (if (null new-version)
+      (setq new-version 3))
+  (if (>= new-version bbdb-file-format)
+      (error "Current BBDB file format is version %d" bbdb-file-format)
+    (let* ((records (bbdb-records))
+           (propnames (bbdb-with-db-buffer bbdb-propnames))
+           (rec)
+           (bbdb-file-format-migration (cons bbdb-file-format new-version))
+           (buf (get-buffer-create (format "*BBDB Version %d*" (cdr bbdb-file-format-migration)))))
+      (message "Unconverting the BBDB database...")
+      (set-buffer buf)
+      (erase-buffer)
+      (insert (format (concat ";;; file-version: %d\n"
+                              ";;; user-fields: %S\n")
+                      new-version (mapcar (function (lambda (x) (intern (car x))))
+                                          propnames)))
+      (while records
+        (setq rec (copy-sequence (car records)))
+        (bbdb-unmigrate-record rec)
+        (aset rec 8 nil)
+        (insert (format "%S\n" rec))
+        (setq records (cdr records)))
+      (pop-to-buffer buf)
+      (message "Unconverting the BBDB database...done"))))