X0202 4 2005-02-28 0001060349 GABELLI ASSET MANAGEMENT INC GBL 0001052192 CASCADE INVESTMENT LLC 2365 CARILLON POINT KIRKLAND WA 98033 0 0 1 0 0000902012 GATES WILLIAM H III ONE MICROSOFT WAY REDMOND WA 98052 0 0 1 0 Convertible Promissory Note 52.00 2005-02-28 4 J 0 50000000.00 D 2001-08-14 2011-08-14 Class A Common Stock 961538 50000000.00 D On August 14, 2001, the Issuer issued to the Reporting Person a $100,000,000 aggregate principal amount Convertible Promissory Note (as amended to date, the "Note"). On February 28, 2005, pursuant to the terms of the Note, the Reporting Person exercised its option to cause the Issuer to purchase $50,000,000 of the principal amount of the Note on April 1, 2005 for a cash purchase price equal to the principal amount of the Note being purchased plus accrued and unpaid interest thereon to but excluding April 1, 2005. * Duly authorized under Special Power of Attorney appointing Michael Larson attorney-in-fact, dated February 4, 2005, by and behalf of William H. Gates III, filed as Exhibit 99.3 to Cascade Investment, L.L.C.'s Amendment No. 5 to Schedule 13G with respect to Canadian National Railway Company on February 11, 2005, SEC File No. 005-48661, and incorporated by reference herein. Cascade Investment, L.L.C. By: /s/ Michael Larson, Business Manager 2005-03-02 William H. Gates III By: /s/ Michael Larson*, Attorney-In-Fact 2005-03-02