Corporate Information

Board of Directors

Robert P. Schechter
CHAIRMAN OF THE BOARD
CHIEF EXECUTIVE OFFICER OF NATURAL MICROSYSTEMS CORPORATION

Zenas W. Hutcheson III
GENERAL PARTNER
ST. PAUL VENTURE CAPITAL

W. Frank King, Ph. D.
PRIVATE INVESTOR,
FORMER PRESIDENT AND CEO OF PSW TECHNOLOGIES

Pamela D. A. Reeve
CHIEF EXECUTIVE OFFICER
LIGHTBRIDGE, INC.

Ronald W. White
GENERAL PARTNER
GSM CAPITAL

Corporate Officers

Robert P. Schechter
CHAIRMAN OF THE BOARD,
PRESIDENT AND CHIEF EXECUTIVE OFFICER

Robert E. Hult
SENIOR VICE PRESIDENT OF FINANCE AND OPERATIONS,
CHIEF FINANCIAL OFFICER AND TREASURER

George D. Kontopidis, Ph. D.
SENIOR VICE PRESIDENT OF ENGINEERING

Dorothy A. Terrell
SENIOR VICE PRESIDENT OF WORLDWIDE SALES AND SERVICES,
PRESIDENT OF THE SERVICES GROUP

R. Brough Turner
SENIOR VICE PRESIDENT OF TECHNOLOGY

Alex N. Braverman
VICE PRESIDENT AND CORPORATE CONTROLLER

Dianne L. Callan
VICE PRESIDENT AND GENERAL COUNSEL

Allen P. Carney
VICE PRESIDENT OF MARKETING

Joel A. Hughes
VICE PRESIDENT OF BUSINESS DEVELOPMENT

James E. Toale
VICE PRESIDENT OF HUMAN RESOURCES

Charles J. Walker
VICE PRESIDENT AND GENERAL MANAGER,
POLICYPOINT DIVISION

Stockholders’ Information

Stock Trading Information
NASDAQ National Market
Symbol NMSS

Transfer Agent
State Street Bank and Trust
Box 8200
Boston, MA 02266

Counsel
Choate, Hall & Stewart
53 State Street
Exchange Place
Boston, MA 02109

Independent Auditors
PricewaterhouseCoopers LLP
One International Place
Boston, MA 02110

Annual Meeting of Stockholders
The Annual Meeting of Stockholders of Natural MicroSystems Corporation will be held on
Friday, April 28,2000 at 1:00 PM,
at the Company’s headquarters,
100 Crossing Boulevard,
Framingham, MA 01702.

Form 10-K Stockholders wishing a copy of Form 10-K may receive one free of charge by contacting investor relations at (508) 271-1204 or by e-mail at info@nmss.com

Natural MicroSystems, Convergence Generation, Fusion, Natural Access, NaturalEdge, and NaturalFax are trademarks of Natural MicroSystems Corporation. CompactPCI is a registered trademark of PCI Industrial Computers Manufacturers Group (PICMG). Ericsson is a trademark of Telefonaktiebolaget LM Ericsson. Lucent Technologies and IP ExchangeComm are trademarks of Lucent Technologies Inc. Electra Elite is a registered trademark of NEC America, Inc. Clarent is a registered trademark of Clarent Corporation. All other product or corporate references may be trademarks or registered trademarks of their respective companies.