"Outl" does not appear in the minibuffer and C-c @ is an undefined key binding.
Next: C-u 1 M-x outline-minor-mode
And now the minor mode is started.
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In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.10.4) of 2013-06-18 on psd15 Windowing system distributor `The X.Org Foundation', version 11.0.70101000
System Description: Red Hat Enterprise Linux Client release 5.4 (Tikanga)
Important settings: value of $LANG: en_US.UTF-8 value of $XMODIFIERS: @im=none locale-coding-system: utf-8-unix default enable-multibyte-characters: t
Major mode: C/l
Minor modes in effect: outline-minor-mode: t tooltip-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t
blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t abbrev-mode: t
Recent input: C-c @ C-u 1 M-x o u t l i n e = <backspace> - m o <backspace>
i n o r - m o d e <return> M-x r e p o r t <tab> < return>
Recent messages: For information about GNU Emacs and the GNU system, type C-h C-a. Loading cc-langs...done Outline minor mode enabled