Item 5.02 Departure of Directors or Certain Officers; Election of Directors;
Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

Hans Peter Hasler, the former Chief Operating Officer and a named executive officer of Biogen Idec Inc., has entered into a consulting agreement with a subsidiary of Biogen Idec Inc. Under the agreement, Mr. Hasler will provide management services for an initial term from May 1, 2009 to December 31, 2009 and thereafter unless either party terminates the agreement. Mr. Hasler will receive 154,000 Swiss francs for his services during the initial term. Mr. Hasler has also agreed to serve as the subsidiary's Chairman of the Board for an annual director's fee of 10,000 Swiss francs.

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