Mercator Becomes Newest OASIS Member and Sponsors XML.ORG

Mercator Broadens XML-to-Any Capabilities With Support for ebXML Initiative

BOSTON, Mass., and WILTON, Conn. - April 27, 2000 - Mercator
Software, (NASDAQ: MCTR), the e-business transformation company™,
today became the newest member of OASIS, the Organization
for the Advancement of Structured Information Standards. Mercator
also announced its affiliate sponsorship of XML.ORG, the OASIS
community for advancing XML industry standardization.

In addition, as part of joining OASIS, Mercator is participating
in the Electronic Business XML (ebXML) Initiative.  ebXML
was formed  by the United Nations CEFACT and OASIS to
develop a technical framework to enable the use of XML in
a consistent manner across all business data in application-to-application,
application-to-person and person-to-application environments. 
In particular, ebXML lowers the barrier-of-entry to electronic
business in order to facilitate trade, particularly with respect
to small- and medium-sized enterprises (SMEs) and developing
nations.  Mercator will take an active role in developing
ebXML.

"We're strong supporters of XML.ORG, an open clearinghouse
for XML specifications," said Dave Power, vice president
of marketing, Mercator Software. "Our customers want
to accelerate the integration of their businesses with their
trading partners; OASIS and Mercator are committed to making
this happen by ensuring interoperability of various XML standards
for business-to-business commerce. Joining OASIS and supporting
ebXML is an important step in delivering the most versatile
e-business integration solution while providing our customers
with substantial time and cost savings."

"By sponsoring OASIS and supporting XML.ORG, Mercator
demonstrates its commitment to product-independent standards
for e-business applications," commented Laura Walker,
executive director of OASIS.  "The XML community-at-large
benefits from the support of XML.ORG by companies like Mercator
who make it possible for OASIS to maintain an unbiased environment
in which the universal data exchange capabilities of XML can
be realized." 

About Mercator E-Business Integration Brokers

Mercator E-Business Integration Broker products capture the
complete semantic descriptions of XML standards transactions
in graphical form, including importing of XML data type definitions
(DTDs), thereby allowing 100% transformation to any other
format through a drag-and-drop interface, without writing
programs.---

About Mercator

Mercator, the e-business transformation company™, provides
e-business integration software.  Its products simplify
customer migration to e-business across every industry, delivering
comprehensive automation for the most difficult e-business
integration tasks.--- The Mercator E-Business Integration
Broker suite of products addresses customer requirements for
business-to-business (B2B), application-to-application (A2A)
and consumer-to-business (C2B) integration in every industry. 
More than 5,000 customers use Mercator's products to accelerate
their transformation to e-business and over 100 partners embed
or resell its technology to enhance their product or service
offerings.  Additional information about Mercator can
be found on the Internet at www.mercator.com.

About XML.ORG

XML.ORG is a vendor-neutral
community for advancing XML industry standardization. Hosted
by OASIS, the XML.ORG website provides news and information
about the application of XML in electronic business environments.
XML.ORG offers valuable online tools, such as the XML.ORG
Catalog, a clearinghouse for industry-specific or cross-industry
XML specifications. Sponsors of XML.ORG include DataChannel,
Documentum, Commerce One, GCA, IBM, Mercator Software, SAP,
SoftQuad and Sun Microsystems.

About OASIS

OASIS  is a
non-profit, international consortium dedicated solely to product-independent
data and content interchange. Focusing on product interoperability,
OASIS embraces the complete spectrum of structured information
standards including XML, SGML and CGM. OASIS sponsors include
Adobe Systems, Aerospatiale, AND-USA, Arbortext, BEA Systems,
Bentley Systems, Boeing, Bowstreet, Bridge, Chrystal Software,
Cohesia, Commerce One, CommerceNet, CompTIA, Corel, DataChannel,
DMSi, Documentum, Dun & Bradstreet, eCredit.com, Enigma,
eXcelon, Extricity Software, GCA, Health Level Seven, IBM,
InformIT, Informix, InterCAP, Interleaf, Interwoven, ISOGEN,
ITEDO, JetForm, Keyfile, Logistics Management Institute, Mercator
Software, Microsoft, NextPage, NII Enterprise Promotion Association,
Nimble.com, NIST, Object Management Group (OMG), Open Applications
Group, Pick Systems, POET Software, ProNet Technology Partners,
Reed Technology, Reuters, Sabre, SAP, Sequoia Software, SoftQuad,
Software AG, STEP, StreamServe, Sun Microsystems, Synthbank,
Visa, Wavo, Webb Interactive Services, webMethods, Whitehill
Technologies, Xerox, XMLSolutions and XyEnterprise.

###

Mercator Software is the new trade name of TSI International
Software, Ltd., headquartered in Wilton, Connecticut. 
The company will seek stockholder approval to formally change
its name at an upcoming stockholders meeting.

Legal Notice Regarding Forward-Looking Statements

Statements in this press release that are not purely historical
are forward-looking statements, including statements regarding
TSI International Software Ltd.'s (the Company) beliefs, expectations,
hopes or intentions regarding the future.  Forward-looking
statements in this release include, but are not limited to,
statements regarding the growth of the enterprise application
market, the demand for the Company's application integration
solutions and the speed of deployment of new products, including
combined Mercator E-business Integration Broker products.  
It is important to note that actual outcomes and the Company's
actual results could differ materially from those in such
forward-looking statements.  Factors that could cause
actual results to differ materially include risks and uncertainties
such as changes in demand for application integration or e-business
integration software and the Company's Mercator E-business
Integration Broker suite of products in particular, the ability
of the Company to expand its international operations, the
ability of the Company to manage expanded global operations,
the ability of the Company to continue to add resellers and
other distribution channels, and the success of third parties
in utilizing and marketing the Company's products, or seasonality
in operating results.  Readers should also refer to the
risk disclosures outlined in the Company's reports filed with
the Securities and Exchange Commission.  All forward-looking
statements and reasons why results might differ included in
this release are made as of the date hereof, based on information
available to the Company as of the date hereof, and the Company
assumes no obligation to update any such forward-looking statement
or reason why results might differ.

Contacts:

Cynthia Cronk
Brockhoff Mercator Software
(203) 761-8600
cbrockhoff@mercator.com

Amy Pavel or Ted Weismann
Lois Paul & Partners, for Mercator
(781) 238-5700
amy_pavel@lpp.com
ted_weismann@lpp.com

Carol Geyer
OASIS
+1 978.667.5115 x209
carol.geyer@oasis-open.org