New file org-mac-massage.el from John Wiegley.

This implements links to Apple Mail messages.

ChangeLog

@@ -1,5 +1,7 @@
 2008-02-04  Carsten Dominik  <dominik@science.uva.nl>
 
+	* org-mac-message.el: New file.
+
 	* org.el (org-remove-timestamp-with-keyword): New function.
 	(org-schedule, org-deadline): Use
 	`org-remove-timestamp-with-keyword' to make sure all such time

org-mac-message.el

@@ -0,0 +1,66 @@
+;;; org-mac-message.el - Support for links to Apple Mail messages by Message-ID
+;; Carstens outline-mode for keeping track of everything.
+;; Copyright (C) 2008 John Wiegley
+;;
+;; Author: John Wiegey <johnw@gnu.org>
+;; Version: 1.1
+;; Keywords: outlines, hypermedia, calendar, wp
+;;
+;; This file is not part of GNU Emacs.
+;;
+;; This file 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 3, or (at your option)
+;; any later version.
+
+;; GNU Emacs 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, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'org)
+
+(org-add-link-type "message" 'org-mac-message-open)
+
+(unless (fboundp 'do-applescript)
+  ;; Need to fake this using shell-command-to-string
+  (defun do-applescript (script)
+    (let (start return)
+      (while (string-match "\n" script)
+	(setq script (replace-match "\r" t t script)))
+      (while (string-match "'" script start)
+	(setq start (+ 2 match-beginning 0)
+	      script (replace-match "\\'" t t script)))
+      (setq cmd (concat "osascript -e '" script "'"))
+      (setq return (shell-command-to-string cmd))
+      (concat "\"" (org-trim return) "\""))))
+
+(defun org-mac-message-open (message-id)
+  "Visit the nnml message with the given Message-ID."
+  (start-process (concat "open message:" message-id) nil
+		 "open" (concat "message:" message-id)))
+
+(defun org-mac-insert-message-link ()
+  (interactive)
+  (let ((subject (do-applescript "tell application \"Mail\"
+	set theMessages to selection
+	subject of beginning of theMessages
+end tell"))
+	(message-id (do-applescript "tell application \"Mail\"
+	set theMessages to selection
+	message id of beginning of theMessages
+end tell")))
+    (insert (org-make-link-string
+	     (concat "message://"
+		     (substring message-id 1 (1- (length message-id))))
+	     (substring subject 1 (1- (length subject)))))))
+
+(provide 'org-mac-message)
+
+;;; org-mac-message.el ends here