"

As COO, Castillo is now responsible for all phases of North America
operations , including oversight of its global call center network,
integration of new vertical markets, speech recognition technologies, and
implementing the company's strategic direction.

on computers

She will also oversee the
company's Quality and Training.

Castillo returned to the North America headquarters in 2003 as Vice
President for Operations, overseeing the opening of four call centers, the
integration of automation technology, the implementation of electronic
workforce management tools and the re -structuring of the company's customer
service representatives' compensation programs.

Detroit Diesel Corporation to Feature New Product Offerings and Solutions at 2005 Mid-America Trucking Show (MATS)

, within the Kentucky Fair and Exposition
Center.

product on

"

About INFONXX

Information services leader INFONXX delivers customer-focused solutions
through technological innovations, flexible service transport options and
industry-leading product offerings. The company offers
a complete line of engines from 170 to 515 horsepower for the on-highway and
vocational markets.

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"After a nationwide search, we realized the best person for the job was
already working for us," said Margaret Scholl, INFONXX North America CEO.

Castillo joined INFONXX in June 2000 as Pennsylvania call center manager. INFONXX employs thousands of customer service
representatives, support personnel , and technical staff, as well as one of
the most reliable speech recognition systems and network architectures in
the industry.

service support

PRESS RELEASE INFONXX Names Michelle Castillo Chief Operating Officer for North America

INFONXX today announced Michelle Castillo has
been promoted to Chief Operating Officer for North America.
Less than one year later, she moved to the company's call center in Tucson ,
Arizona, where for a time she also managed the California call center.

Scholl added, "Michelle brings a positive perspective, a drive for
excellence and a record of success into her new duties .infonxx.

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Castillo attended the University of North Carolina Charlotte. As the world's largest independent
provider of directory assistance and enhanced information services, INFONXX
was ranked first throughout 2005 among third-party DA providers in the
Paisley Group's National Directory Assistance Performance Index(SM) in the
key indicator of "Calls Passed" -- the overall measure of customers cared
for and fulfilled.

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A veteran of
call center operations, she also worked with Sprint and Time Warner Cable
in various call center capacities. As the company
continues to grow, her steady leadership and vast experience will be a
vital part of our senior management team. LOUISVILLE , Ky.

Detroit Diesel Corporation is the leading manufacturer of on-highway
heavy-duty diesel engines for the commercial truck market.

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"Her significant talents and skills make her a perfect fit in her expanded
operational role. For more information, visit http://www.

companies line

com/.

Through its corporate headquarters in Detroit, Michigan,
Detroit Diesel is engaged in the design , manufacture, sale and service of
these products, in addition to supporting alternative and hybrid engine
strategies for the commercial truck marketplace.

support acer

Detroit Diesel is a
subsidiary of DaimlerChrysler and part of the Freightliner Group.