Abbey, Gardy & Squitieri, LLP Files Class Action Which Includes MCK and HBOC Investors.

NEW YORK--(BUSINESS WIRE)--April 30, 1999--

The following was released today by Abbey, Gardy & Squitieri, LLP:

-- All purchasers of McKesson Corp. or McKesson HBOC Inc. (NYSE:

MCK) securities between October 18, 1999 and April 27, 1999;

-- All purchasers of HBO & Company securities between April 14, 1998

and January 12, 1999;

-- All investors whose HBO & Company stock was exchanged for

McKesson HBOC Inc. stock pursuant to the January 12, 1999 merger.

You are hereby notified that a securities fraud class action lawsuit has been commenced in U.S. District Court in San Francisco against McKesson HBOC Inc. and certain of its officers and directors.

If you are a member of the class described above, you may, not later than June 28, 1999, move the court to serve as a lead plaintiff of a class action seeking to recover monetary damages on behalf of all similarly-situated investors, excluding the defendants and their affiliates.

If you wish to discuss this action, or would like to request a copy of the complaint filed, please CONTACT:

Mark C. Gardy, Esq. Nancy Kaboolian, Esq. James S. Notis, Esq. Abbey, Gardy & Squitieri, LLP 212 East 39th Street New York, New York 10016 TELEPHONE: [phone] or [phone] FAX: [phone] E-MAIL: [e-mail] -or- James Jay Seirmarco, Esq. Abbey, Gardy & Squitieri, LLP 595 Market Street, Suite 2500 San Francisco, California 94105 TELEPHONE: [phone] FAX: [phone] E-MAIL: [e-mail]