================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 ---------------

                                 SCHEDULE 14D-9
                                 (RULE 14D-101)

               SOLICITATION/RECOMMENDATION STATEMENT UNDER SECTION
                 14(D)(4) OF THE SECURITIES EXCHANGE ACT OF 1934

                             MERCATOR SOFTWARE, INC.
                            (Name of Subject Company)

                             MERCATOR SOFTWARE, INC.
                      (Name of Person(s) Filing Statement)

                     COMMON STOCK, PAR VALUE $0.01 PER SHARE
           (INCLUDING THE ASSOCIATED PREFERRED STOCK PURCHASE RIGHTS)
                         (Title of Class of Securities)

                                    587587106
                      (CUSIP Number of Class of Securities)

                                 ---------------

                                   ROY C. KING
                 CHAIRMAN, CHIEF EXECUTIVE OFFICER AND PRESIDENT
                             MERCATOR SOFTWARE, INC.
                                 45 DANBURY ROAD
                                WILTON, CT 06897
                            TELEPHONE: (203) 761-8600
       (Name, address and telephone number of person authorized to receive
      notice and communication on behalf of the person(s) filing statement)

                                    Copy to:

                             MICHAEL WEINSIER, ESQ.
                           CHARLES A. SAMUELSON, ESQ.
                      JENKENS & GILCHRIST PARKER CHAPIN LLP
                              405 LEXINGTON AVENUE
                               NEW YORK, NY 10174
                            TELEPHONE: (212) 704-6000

|X|  Check the box if the filing relates solely to preliminary communications
     made before the commencement of a tender offer.

================================================================================





                              ASCENTIAL - MERCATOR

                               Messaging Document



                                   August 2003





                    "The Enterprise Data Integration Leader"







                                                                                       
SECTION I: KEY POINTS AND MESSAGES SUMMARY..................................................4


SECTION II: ADDITIONAL INFORMATION ON KEY POINTS............................................6

         GROWTH-ORIENTED ACQUISITION SIGNIFICANTLY EXPANDS ASCENTIAL'S SIZE AND SCALE       6

         EXTENDS ASCENTIAL'S ENTERPRISE DATA INTEGRATION LEADERSHIP                         8

         DELIVERS SIGNIFICANT VALUE AND BENEFITS TO OUR CUSTOMERS AND PARTNERS             10

         PROVIDES FINANCIAL LEVERAGE AND BENEFITS                                          13



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Copyright (C) Ascential Software Corporation, 2003                        Page 3
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SECTION I: KEY POINTS AND MESSAGE OVERVIEW


1.   GROWTH-ORIENTED ACQUISITION SIGNIFICANTLY EXPANDS ASCENTIAL'S SIZE AND
     SCALE

          o    The combined company becomes the largest independent enterprise
               data integration software company with $250 million in annualized
               revenue and more than 3,000 customers worldwide

          o    Mercator and Ascential products and services are complementary
               and create the potential for significant cross-sell opportunities
               resulting in new revenue streams generated from the companies'
               complementary products, channels and geographic presence

          o    Larger combined global sales, services and support operations
               create a foundation for accelerate revenue growth

          o    Partners can benefit from product set's expanded capabilities and
               significant value-add; Expanded ecosystem broadens company's
               market reach

          o    Elevates the visibility and strategic importance of the combined
               company within the enterprise IT community


2.   THE COMBINATION OF MERCATOR AND ASCENTIAL EXTENDS OUR ENTERPRISE DATA
     INTEGRATION LEADERSHIP

          o    Creates the industry's first and most comprehensive product set
               to support the full spectrum of transactional, operational, and
               analytical data integration requirements, regardless of data
               volumes or latency

          o    Significant accumulation of talent, with deep domain expertise,
               provides extensive resources for technology innovation, customer
               value and global reach

          o    Single-vendor solution for enterprise data integration software,
               services and support designed to reduce customers' time-to-value
               and protect investments

          o    Designed to complement customer's existing business intelligence
               (BI), business process integration (BPI), enterprise application
               integration (EAI), enterprise information integration (EII) and
               Business Intelligence (BI) investments with the benefits of
               anytime, in-flight data integration capabilities

          o    Supports our strategic vision of evolving our product set
               capabilities into a unified Enterprise Data Integration platform
               easily deployed as a set of service-oriented data integration
               services


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3.   DELIVERS SIGNIFICANT VALUE AND BENEFITS TO OUR CUSTOMERS AND PARTNERS

          o    Mercator customers can benefit from Ascential Software's
               infinitely scalable suite of data profiling, data quality,
               transformation and meta data management products

          o    Ascential customers can benefit from Mercator's vertical industry
               standard adaptors, industry-ready solutions, transaction-oriented
               data transformation and routing capabilities, and technology and
               vertical market domain expertise

          o    The combined company's customers can benefit from superior value
               and ROI through:

                    |X|  Reduced risk, cost and complexity from a single-vendor,
                         single-solution approach that supports the full
                         spectrum of transactional, operational, and analytical
                         data integration requirements

                    |X|  Continued stream of innovative new products resulting
                         from the accumulation of talent and resources from a
                         strategic vendor with long-term staying power and R&D
                         investment capacity

                    |X|  Ability to deploy large scale mission critical data
                         integration solutions backed by expanded global sales,
                         service and support operations


4.   PROVIDES FINANCIAL LEVERAGE AND BENEFITS

          o    Expected to be accretive within the first year of operations, by
               leveraging:

                    |X|  Increased sales, services and marketing capacity and
                         experience

                    |X|  Expanded R & D staff, scope and experience

                    |X|  Revenue synergies - cross selling and new revenue
                         streams

                    |X|  Cost synergies from overlapping functions, mostly
                         administrative in nature, facilities and programs

          o    Expected to accelerate achievement of long term operating margin
               goals

          o    Substantial financial resources remain following the acquisition



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SECTION II: ADDITIONAL INFORMATION ON KEY POINTS

1.   GROWTH-ORIENTED ACQUISITION SIGNIFICANTLY EXPANDS ASCENTIAL'S SIZE AND
     SCALE

     |X|  THE COMBINED COMPANY BECOMES THE LARGEST INDEPENDENT ENTERPRISE DATA
          INTEGRATION SOFTWARE COMPANY WITH $250 MILLION IN ANNUALIZED REVENUE
          AND MORE THAN 3,000 CUSTOMERS WORLDWIDE

          This is a strategic, growth-oriented acquisition, which combines two
          companies with complementary products/technologies, distribution
          channels, strategic alliances, and geographic presence. The
          combination is not about consolidation; rather it provides a unique
          opportunity to combine the technology, people, customers, and partners
          of both companies into a single company to create the largest
          independent enterprise data integration software company - with
          annualized revenue of approximately $250 million and over 3,000
          customers and over 900 employees globally.


     o    MERCATOR AND ASCENTIAL PRODUCTS AND SERVICES ARE COMPLEMENTARY AND
          CREATE THE POTENTIAL FOR SIGNIFICANT CROSS-SELL OPPORTUNITIES
          RESULTING IN NEW REVENUE STREAMS GENERATED FROM THE COMPANIES'
          COMPLEMENTARY PRODUCTS, CHANNELS AND GEOGRAPHIC PRESENCE

          By addressing the complete breadth of enterprise data integration
          requirements, the combined company garners significant cross-selling
          opportunities and the potential for new revenue streams resulting from
          the company's complementary data integration capabilities, services,
          channels, strategic alliances, and geographic coverage.

          Mercator's data integration offerings, which are designed to transform
          and route data in transactional environments are a perfect complement
          to Ascential's established data integration offerings primarily
          deployed in analytical and data warehousing environments. As a result,
          the combined company is uniquely positioned to address the complete
          spectrum of high performance data integration challenges commonplace
          in enterprise-scale IT environments.

          A typical enterprise has multiple data integration requirements across
          their entire IT infrastructure, and they are looking to utilize a
          smaller number of strategic vendors to better leverage their internal
          skill sets and software investments. This presents an enormous
          opportunity for the combined to cross-sell it's expanded offerings to
          it's 3,000+ customers, and provides a significant competitive
          advantage when competing in situations where prospects are seeking to
          standardize on a single-vendor, single solution for their complete
          enterprise data integration requirements.


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Ascential-Mercator FAQ Document                                   August 4, 2003
--------------------------------------------------------------------------------

o    LARGER COMBINED GLOBAL SALES, SERVICES AND SUPPORT OPERATIONS HELP
     ACCELERATE REVENUE GROWTH

          o    Increase in size of sales force expands geographic and account
               coverage expected to create greater visibility into new IT
               projects and business opportunities

          o    Expanded product set addresses a broader spectrum of data
               integration requirements increasing the potential for account
               penetration and sales opportunities

          o    Expanded global services operation, with deep domain expertise in
               technology and vertical markets, expected to enhance support for
               enterprise-scale project implementations


o    PARTNERS BENEFIT FROM PRODUCT SET'S EXPANDED CAPABILITIES AND SIGNIFICANT
     VALUE-ADD: EXPANDED ECOSYSTEM BROADENS COMPANY'S MARKET REACH

     Both companies are focused on growing partner-influenced and embedded
     license revenue, and this will continue to be a vital component of
     Ascential's strategy. Mercator's 2002 partner influenced license revenue
     grew to 46%, from 27% in 2001. Ascential's Q2 2003 partner influenced
     license revenue was approximately 50%.

     The combined company's strategic partnerships include technology vendors
     such as IBM, BEA, HP, SAP, Lawson Software, Oracle, PeopleSoft, Microsoft,
     Business Objects, Hyperion, Cognos and Sun Microsystems; and systems
     integrators such as Accenture, BearingPoint, Cap Gemini, Deloitte
     Consulting, EDS, CSC, and IBM Business Consulting. This acquisition is
     expected to strengthen Ascential's relationships with all of these
     partners, especially Ascential's partnership with the IBM Software Group
     and their broad spectrum of complementary on-demand integration
     capabilities.

     Our combined company enables a more comprehensive and complete solution on
     top of our product set and integrates with other integration and business
     intelligence offerings as part of a partner's end-to-end offering.

     We are committed to supporting its partners with the companies' combined
     offerings and an explicit focus on partner-oriented sales, marketing,
     training and support.

     o    ELEVATES THE VISIBILITY AND STRATEGIC IMPORTANCE OF THE COMBINED
          COMPANY WITHIN THE ENTERPRISE IT COMMUNITY

          o    Significant industry transaction likely to generate significant
               business and industry press, financial analyst, and industry
               analyst coverage


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          o    Increased impact from additional marketing resources on company
               image and awareness

          o    Expanded sales and services operation drives increased customer
               and prospect coverage and interaction

          o    Industry leader status anticipated to provide greater levels of
               awareness and interest in news and opinion communicated by
               company


2.   THE COMBINATION OF MERCATOR AND ASCENTIAL EXTENDS OUR ENTERPRISE DATA
     INTEGRATION LEADERSHIP

o    CREATES THE INDUSTRY'S FIRST AND MOST COMPREHENSIVE PRODUCT SET TO SUPPORT
     THE FULL SPECTRUM OF TRANSACTIONAL, OPERATIONAL, AND ANALYTICAL DATA
     INTEGRATION REQUIREMENTS, REGARDLESS OF DATA VOLUMES OR LATENCY

     Ascential's expanded enterprise data integration capabilities now
     encompass:

          o    Unlimited scalability

          o    Meta Data Driven Lifecycle

          o    National Language Support (NLS)

          o    Technology standards - EDI, Web Services, XML, J2EE, JMS, Java,
               J2C

          o    Industry standards - HIPAA, SWIFT, ACORD

          o    Open, extensible and flexible Service-oriented Architecture (SOA)

          o    Intelligent and Reusable Data Transformation and Routing

          o    Anytime, Anywhere Enterprise Data Integration - such as IMS,
               Siebel, CICS, SAP

          o    Multi-source Data Profiling and Data Quality Standardization,
               Matching and Linking

          o    Vertical Industry-ready and standards-based (EDI, SWIFT, HIPAA)
               data integration offerings for finance, healthcare, retail,
               manufacturing and distribution

          o    Interoperability with enterprise application (EAI) and business
               process integration (BPI) solutions from IBM, BEA, SeeBeyond,
               WebMethods and TIBCO among others


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          o    Open data integration solutions to existing or future customer
               investments in enterprise application, business intelligence
               tools, and systems platforms


o    SIGNIFICANT ACCUMULATION OF TALENT, WITH DEEP DOMAIN EXPERTISE, PROVIDES
     EXTENSIVE RESOURCES FOR TECHNOLOGY INNOVATION, CUSTOMER VALUE AND GLOBAL
     REACH

o    SINGLE-VENDOR SOLUTION FOR ENTERPRISE DATA INTEGRATION SOFTWARE, SERVICES
     AND SUPPORT REDUCES CUSTOMER'S TIME-TO-VALUE, AND PROTECTS INVESTMENTS

          o    Reduce risk and complexity associated with "integrating the
               integration tools" common with a multi-vendor solution approach

          o    Streamlines problem identification and resolution due to
               single-vendor approach

          o    Reduced contract administration costs for customers and partners

          o    Complements customer's existing business intelligence (BI)
               business process integration (BPI), enterprise application
               integration (EAI), and enterprise information integration (EII)
               with the benefits of anytime, in-flight data integration
               capabilities

          o    Seamless integration of products through standards such as
               Enterprise Java Beans (EJB), Java Messaging Service (JMS) and Web
               Services

          o    Enables the sharing and reuse data transformation logic across
               all integration technologies primarily for optimum consistency
               and accuracy of critical business information


o    SUPPORTS OUR STRATEGIC VISION OF EVOLVING ITS PRODUCT SET CAPABILITIES INTO
     A UNIFIED ENTERPRISE DATA INTEGRATION PLATFORM EASILY DEPLOYED AS A SET OF
     SERVICE-ORIENTED DATA INTEGRATION SERVICES

          o    Ascential plans to continue to protect customer's investment in
               Mercator's technologies and as a result of the expanded resources
               from this combination, will accelerate the continued enrichment
               of its offerings into a unified Enterprise Data Integration
               platform easily deployed as a set of service-oriented data
               integration services

          o    Track record of successfully integrating acquired technologies
               and talent with internal development. This leads to optimum
               time-to-market with a premium


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               on quality, innovation and maximizing customer value through
               depth of functionality combined with broader solution scope


3.   DELIVERS SIGNIFICANT VALUE AND BENEFITS TO OUR CUSTOMERS AND PARTNERS

o    MERCATOR CUSTOMERS SHOULD BENEFIT FROM ASCENTIAL SOFTWARE'S INFINITELY
     SCALABLE SUITE OF DATA PROFILING, DATA QUALITY, TRANSFORMATION AND META
     DATA MANAGEMENT, DESIGNED TO:

          o    Enable greater business visibility by augmenting historical with
               transactional data sources in real-time to provide reliable,
               consistent, and actionable information across the enterprise

          o    Create the most accurate and reliable consolidated reference data
               containing the corporation's single version of the truth that
               synchronizes key customer, product, or supplier information
               across all business systems and partner interactions

          o    Enhance customer service experience by reducing the percentage of
               incomplete processes through embedded and systematic in-flight
               data transformation, validation and standardization to ensure
               accurate and complete data entry experience

          o    Designed for on-the-fly data access and re-purposing for use by
               portals and contemporary real-time applications, and processes,
               without labor intensive and fragile, hand coded application and
               legacy data source integration containing complex cross-silo
               relationships


o    ASCENTIAL CUSTOMERS SHOULD BENEFIT FROM MERCATOR'S INDUSTRY STANDARD
     ADAPTORS, INDUSTRY-READY SOLUTIONS, TRANSACTION-ORIENTED DATA
     TRANSFORMATION AND ROUTING CAPABILITIES, AND TECHNOLOGIES AND VERTICAL
     MARKET DOMAIN EXPERTISE

          o    Transparency between multiple exchange formats and protocols
               prevalent in legacy mainframe and Electronic Data Interchange
               (EDI) sources and contemporary XML-based data exchange standards

          o    Enabling exchange of data in real-time between front and
               back-office systems triggered by application (or external) events
               and repurposed using complex transformations and conditional
               routing among dissimilar applications, protocols and platforms


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          o    Seamless Financial Services solutions that facilitate the flow of
               risk-bearing transactions between banks, securities firms, and
               other financial service providers, delivering comprehensive
               straight through processing that reduces risk and increases
               operational efficiencies

          o    Streamline Healthcare adjudication and supports eHealth
               initiatives, enabling healthcare organizations to leverage
               tactical compliance into long-term strategic advantage

          o    Retail, Distribution and Manufacturing solutions help
               manufacturers, retailers, and distributors meet the business
               demands associated with supply chain responsiveness and
               flexibility, as well as collaboration within and between
               organizations


o    ALL CUSTOMERS SHOULD BENEFIT FROM SUPERIOR VALUE AND ROI THROUGH:

          o    Reduced risk, cost and complexity from a single-vendor,
               single-solution approach that supports the full spectrum of
               transactional, operational, and analytical data integration
               requirements

               The combined company's complementary cross platform capabilities
               reduce the on-going time and expense of piecing together, and
               maintaining, different vendor's technologies to achieve the same
               solution


          o    CONTINUED STREAM OF INNOVATIVE NEW PRODUCTS RESULTING FROM THE
               ACCUMULATION OF TALENT AND RESOURCES FROM A STRATEGIC VENDOR WITH
               LONG-TERM STAYING POWER AND R&D INVESTMENT CAPACITY

                    o    Combined company possesses deep domain expertise in
                         large scale, design, development, and deployment of
                         mission-critical data integration solutions

                    o    Leverage unique skills in real-time systems, parallel
                         processing architectures, enterprise applications,
                         business intelligence and data warehousing

                    o    Track record of successfully integrating acquired
                         technologies and talent with internal development. This
                         leads to improved time-to-market with premium on
                         quality, innovation and maximizing customer value
                         through the depth of functionality combined with
                         broader scope


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o    ABILITY TO DEPLOY LARGE SCALE MISSION CRITICAL DATA INTEGRATION SOLUTIONS
     BACKED BY EXPANDED GLOBAL SALES, SERVICE AND SUPPORT OPERATIONS

          o    Expands size and scale of combined customer-facing operations

          o    Leverage from cross-training increases resources available to
               assist in customer problem identification and resolution

          o    Shared best practices and knowledge base improves customer
               experience, customer service and improves Ascential's product
               development



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4.   PROVIDES FINANCIAL LEVERAGE AND BENEFITS

o    Currently expected to be accretive within the first year of operations, by
     leveraging:

     o    Increased sales, services and marketing capacity and experience

               o    Larger sales force and broader product offering enable
                    Ascential to expand its customer reach

               o    Increase marketing and services "share of voice" and brand
                    recognition

     o    Expanded R & D staff, scope and experience

     o    Significant accumulation of talent and domain expertise results in
          confirmed product differentiation and consequently drives growth
          potential

     o    Revenue synergies

               o    Significant cross-selling opportunities and value-add in
                    combined customer base

               o    Added capability in five key vertical industries: finance,
                    healthcare, retail, manufacturing and distribution

     o    Expected cost synergies from overlapping functions, mostly
          administrative in nature, facilities and programs

     o    Expected acceleration of achievement of long term target operating
          margin goals

     o    Substantial financial resources remain following the acquisition



This document contains forward-looking statements, as well as a number of
assumptions about future events and are subject to important factors and
uncertainties that could cause actual results to differ materially from those
described in the forward-looking statements. The forward-looking statements in
this document address a variety of subjects including, for example, benefits of
the proposed transaction; expected synergies attained through the combination;
revenues and earnings expected following the acquisition; the ability to retain
customers and maintain revenue streams; cross-selling opportunities; revenue
growth; market reach and leadership; visibility and strategic importance of the
combined company; expected financial leverage and benefits; partner influenced
license revenue; the ability of Ascential Software to retain substantial
financial resources; customer and partner reaction to the combination and
benefits to customers and partners; focus on partner-oriented sales, marketing,
training and support; generation of significant business and press and analyst
coverage; impact from additional marketing; the creation of a product set that
will support the full spectrum of data integration requirements regardless of
data volumes or latency; extension and deepening of Ascential Software's
resources, visibility and strategic importance of Ascential Software within the
enterprise IT community; the functionality, characteristics, quality and
performance capabilities of each company's products and technology; results
achievable and benefits attainable through deployment of each company's
products; customer requirements and expectations; and return on IT investment.
The following factors, among others, could cause actual results to differ
materially from those described in these forward-looking statements: the
acquisition may not be completed; the closing of the acquisition may be delayed;
required regulatory approvals may not be granted; shareholders may not tender
their shares or vote in favor of a merger; the businesses may not be
successfully integrated or the transition may require substantial time; the
integration may involve unexpected costs; both businesses may suffer as a result
of uncertainty surrounding the transaction; key employees may


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depart the company following the acquisition; customers of each business may not
adopt technology of the other business; as well as other factors, such as, the
ability of Ascential Software to expand its market share; growth rates for the
enterprise data integration software market; general business conditions in the
software industry, the technology sector, and in the domestic and international
economies; rapid technological change in the markets served by Ascential
Software; dependence on international operations; global and geopolitical
instability; and difficulties that Ascential Software may experience integrating
technologies, operations and personnel of completed or future acquisitions. For
a detailed discussion of these and other cautionary statements, please refer to
the filings made by Ascential Software with the Securities and Exchange
Commission, including, without limitation, the most recent Quarterly Report on
Form 10-Q. Ascential Software disclaims any intent or obligation to update any
forward-looking statements made herein to reflect any change in Ascential
Software's expectations with regard thereto or any change in events, conditions,
or circumstances on which such statements are based.

If a tender offer is commenced, any Offer to Purchase will be sent to all
Mercator stockholders. This document will contain important information and
should be read by stockholders. A tender offer statement on Schedule TO, which
will include the Offer to Purchase and other exhibits, will be filed with the
Securities and Exchange Commission. All documents filed with the SEC can be
examined for free at the SEC web site (HTTP://WWW.SEC.GOV.). They are also
available without charge by calling the Investor Relations department at
508.366.3888 or by sending a written request to that department at Investor
Relations, Ascential Software Corporation, 50 Washington Street, Westborough,
Massachusetts 01581.

(C) 2003 Ascential Software Corporation. All rights reserved. Ascential is a
trademark of Ascential Software Corporation or its affiliates and may be
registered in the United States or other jurisdictions. Other marks are the
property of the owners of those marks.


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