EXHIBIT 4.4 CERTIFICATE OF TRUST The undersigned, the trustees of McKesson Financing Trust IV, desiring to form a business trust pursuant to Delaware Business Trust Act, 12 Del. C. (S) ---- -- 3801 et seq., hereby certify as follows: -- --- i. The name of the business trust being formed hereby (the "Trust") is "McKesson Financing Trust IV." ii. The name and business address of the trustee of the Trust which has its principal place of business in the State of Delaware is as follows: First Chicago Delaware Inc. 300 King Street Wilmington, DE 19801 iii. This Certificate of Trust shall be effective as of the date of its filing. Dated: April 23, 1998 /s/ Nancy Miller ---------------------------------------- Name: Nancy Miller Title: Regular Trustee THE FIRST NATIONAL BANK OF CHICAGO, as Institutional Trustee By: /s/ Steve Wagner --------------------------------------- Name: Steve Wagner Title: Vice President FIRST CHICAGO DELAWARE INC., as Delaware Trustee By: /s/ Steve Wagner --------------------------------------- Name: Steve Wagner Title: Vice President