FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * PURE PAMELA J   2. Issuer Name and Ticker or Trading Symbol MCKESSON CORP [MCK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP, Pres. Provider Tech. (Last) (First) (Middle) 1 POST STREET 3. Date of Earliest Transaction (Month/Day/Year) 04/18/2007 (Street) SAN FRANCISCO, CA 94104 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 04/18/2007   M   15,900 A $ 28.28 18,804.925 D   Common Stock 04/18/2007   S   15,900 (1) D $ 60 2,904.9251 (2) D   Common Stock 04/18/2007   M   34,100 A $ 29.75 37,004.925 D   Common Stock 04/18/2007   S   34,100 (1) D $ 60 2,904.9251 D   Common Stock               1,091 I By Trustee of PSIP Common Stock               681.4395 (3) I By Spouse Common Stock               5 (4) I Cust'n Son GA TMA

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Option (Right-to-Buy)

$ 28.28

04/18/2007

M

15,900 (1)

(5)

01/27/2013

Common Stock

15,900

$ 0

0

D

Employee Stock Option (Right-to-buy)

$ 29.75

04/18/2007

M

34,100 (1)

(5)

03/30/2014

Common Stock

34,100

$ 0

15,900

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
PURE PAMELA J 1 POST STREET SAN FRANCISCO, CA 94104			EVP, Pres. Provider Tech.

Signatures

Donna Spinola, Attorney-in-fact		04/19/2007
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Sale was made pursuant to a previously adopted plan dated 12/14/2006, intended to comply with Rule 10b5-1(c).
(2)	Includes 2904.9251 shares acquired pursuant to the Company's ESPP.
(3)	Includes 681.4395 shares acquired pursuant to the Company's ESPP.
(4)	Prior gift to minor son. The reporting person disclaims beneficial ownership of these shares, and this report shall not be deemed an admission that the reporting person is the beneficial owner of these shares
(5)	Grant vested over 4 years at an annual rate of 25% of the total shares granted, commencing on the first anniversary of the grant date.

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