+(defvar diary-from-outlook-function nil
+ "If non-nil, a function of one argument for `diary-from-outlook' to call.
+If the current buffer contains an Outlook-style appointment message,
+this function should extract it into a diary entry. If the argument is
+nil, it should ask for confirmation before adding this entry to the diary.
+For examples, see `diary-from-outlook-rmail' and `diary-from-outlook-gnus'.")
+