Exxon Mobil Corporation

  ExxonMobil Participates in Expanded Production from Gulf of Mexico
                            Princess Field

Exxon Mobil Corporation (NYSE:XOM) announced today its participation
in the startup of production from the Princess field subsea wells,
located approximately 140 miles southeast of New Orleans in the Gulf
of Mexico. Production at the field is currently flowing at an
approximate rate of 9,000 barrels of oil and 15 million cubic feet of
gas per day. Production began on December 17, 2003.
    The co-venturers are planning for a continued phased development
of Princess, which is located in Mississippi Canyon 765 and 766, in
3,650 feet of water. The initial phase consists of one well (A10) on
the Ursa tension leg platform (ExxonMobil interest 16 percent) and an
expandable three-well subsea system tied back to Ursa less than four
miles away. The Ursa A10 well began production in the fourth quarter
of 2002. Peak production for Princess' initial stage of development is
estimated to be 55,000 barrels of oil and 110 million cubic feet of
gas per day. Total gross ultimate recovery for the Princess project is
estimated to be 175 million barrels of oil equivalent.
    "The Princess project utilizes a number of technological
advancements for Gulf of Mexico deepwater production, and is another
example of profitable resource development through the use of existing
infrastructure in established areas," said Thomas R. Walters, vice
president for ExxonMobil Production Company.
    Working interest owners of Princess are Shell, operator (45
percent), BP (23 percent), ExxonMobil (16 percent), and ConocoPhillips
(16 percent).

    CAUTIONARY STATEMENT: Estimates, expectations, and business plans
in this release are forward-looking statements. Actual future results,
including resource recoveries, production rates, and project plans and
schedules, could differ materially due to changes in market conditions
affecting the oil and gas industry, political developments, technical
or operating factors, and other factors discussed under the heading
"Factors Affecting Future Results" included in Item 1 of ExxonMobil's
most recent Form 10-K and posted on our website (www.exxonmobil.com).
References to quantities of oil and gas include amounts that are not
yet classified as proved reserves but that we believe will be produced
in the future.

    CONTACT: ExxonMobil
             Bob Davis, 713-656-7544