Press Release

PalmSource Announces Pricing of Equity Offering

SUNNYVALE, Calif.- April 2, 2004 — PalmSource, Inc. (NASDAQ: PSRC) today announced the pricing of its public offering of 3,000,000 shares of common stock at a price to the public of $18.00 per share. All shares are being offered by the company. In addition, the underwriters have been granted an option to purchase up to an additional 450,000 shares from PalmSource solely to cover over-allotments, if any. The offering is made by an underwriting group consisting of Deutsche Bank Securities Inc., Needham & Company, Inc. and First Albany Capital Inc.

A registration statement relating to these securities was filed with and has been declared effective by the U.S. Securities and Exchange Commission. This press release does not constitute an offer to sell or the solicitation of an offer to buy any of the securities of PalmSource, and there shall be no sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. This offering of the shares of common stock may be made only by means of a prospectus, copies of which can be obtained from Deutsche Bank Securities Inc., 60 Wall Street, 4th Floor, New York, New York 10005.