Stockholders and other interested parties may communicate with the Lead Independent Director or any of the directors by addressing their correspondence to the Board Member or Members at:

c/o the Corporate Secretary's Office
 McKesson Corporation
 One Post Street, 35th Floor
 San Francisco, CA 94104

Or via email at: leaddirector@mckesson.com, or nonmanagementdirectors@mckesson.com

The Board has instructed the Corporate Secretary, prior to forwarding any correspondence, to review such correspondence and, in her discretion, not to forward certain items if they are not relevant to and consistent with the Company's operations, policies and philosophies, are deemed of a commercial or frivolous nature or otherwise inappropriate for the Board's consideration. The Corporate Secretary's office maintains a log of all correspondence received by the Company that is addressed to members of the Board. Directors may review the log at any time, and request copies of any correspondence received.