BIOGEN IDEC INC.
2006 NON-EMPLOYEE DIRECTORS EQUITY PLAN
The Biogen Idec Inc. 2006 Non-Employee Directors Equity Plan (“the Plan”) is hereby amended as follows:
In paragraph (b) of Section 4 (“Stock Subject to the Plan”), the words “with respect to dividends or distributions
of cash or other non-stock property” are hereby added immediately after the words “unless otherwise
determined by the Committee in its sole and absolute discretion”.
Date: October 13, 2008