For the following org-mode training course rules, if your .emacs has the following:
(require 'org-install)
The above will not work. You can go too far and add
(require 'org)
But a more elegant solution would be to embed your (define-key ...) in
(eval-after-load "org"
'(progn
(define-key org-mode-map (kbd "C-<tab>") 'tabbar-forward)))
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