ADVISORY/SeeBeyond to Host Inaugural European Customer Conference.

News Editors/Business Editors/High-Tech Writers

ADVISORY...for June 10-12

HORIZONS Europe 2003

--(BUSINESS WIRE)

SeeBeyond (Nasdaq:SBYN):

Horizons Europe 2003 To Demonstrate Latest Innovations

In Enterprise Integration And Composite Application Assembly

WHAT:    SeeBeyond invites customers, software, and business and
         technology consulting partners to its inaugural European
         customer conference, HORIZONS Europe 2003. The HORIZONS
         Europe 2003 conference, which will be held in Amsterdam
         June 10th -- 12th, will offer SeeBeyond customers and
         partners a unique opportunity to hear about the latest
         innovations in enterprise integration and composite
         application assembly, along with the opportunity to exchange
         ideas in a stimulating, but informal setting. An important
         forum for the pan-European SeeBeyond community, HORIZONS
         Europe 2003 will also enable attendees to network with
         colleagues, share experiences and take advantage of a diverse
         offering of presentations, demonstrations and exhibits from
         SeeBeyond and its key partners. Following are just a few of
         the highlights slated for HORIZONS Europe 2003:

    --  SeeBeyond will showcase the newly released SeeBeyond
        Integrated Composite Application Network (ICAN) Suite v5.0, a
        powerful standards-compliant platform for the development of
        integrated composition application networks.

    --  Keynote sessions featuring executives from SeeBeyond,
        Accenture and Siebel Systems along with guest speaker and
        noted industry analyst Massimo Pezzini of Gartner Group will
        provide valuable insights into both the technology and
        business perspectives surrounding enterprise integration
        including product overviews, ROI methodology and the business
        benefits of deploying an integrated composite application
        network.

    --  Breakout sessions will include presentations from SeeBeyond
        customers such as AXA Group Insurance, Air Liquide,
        Heidelberger Druckmaschinen AG, WH Smith and Zurich Cantonal
        Bank, who will discuss their unique implementations of
        SeeBeyond solutions aimed at streamlining business processes
        and improving operating performance.

WHEN:    June 10 -- 12, 2003

WHERE:   Hotels van Oranje
         Amsterdam, The Netherlands

CONTACT: Any questions regarding HORIZONS Europe 2003 can be
         directed to: [e-mail].

About SeeBeyond

Based on 14 years of software innovation and real-world experience in integrating systems across Global 2000 organizations, SeeBeyond (Nasdaq:SBYN) delivers the industry's most comprehensive, standards-compliant network for the rapid assembly and deployment of enterprise-scale end-user applications built on existing systems and infrastructure. Beyond integration, the SeeBeyond(R) Integrated Composite Application Network (ICAN) Suite helps organizations dramatically improve business operations resulting in reduced costs, increased market share and improved customer service. SeeBeyond has more than 1,780 customers worldwide, including ABB, ABN Amro, Bausch & Lomb, BHP Billiton, The Cleveland Clinic, The Dial Corporation, DuPont, Florida Power & Light, Fluor Daniel, Fujitsu, General Motors, Hewlett-Packard, Pfizer, Samsung, Sprint, Sutter Health and United Healthcare. For more information, please visit www.seebeyond.com.

SeeBeyond is a registered trademark of SeeBeyond. All other brands or product names are trademarks of their respective owners.