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Exhibit 99.1 (NEWS RELEASE-NORTEL LOGO) www.nortel.comFOR IMMEDIATE RELEASE
    
    January 10, 2005For more information:Media
    
    InvestorsTina Warren
    
    (888) 901-7286(905) 863-4702
    
    (905) 863-6049tinawarr@nortelnetworks.com
    
    investor@nortelnetworks.com
 Nortel Networks Corporation to File 2003 Financial Statements TORONTO  Nortel Networks* Corporation [NYSE/TSX:NT] today announced that it expects to
commence filing its audited financial statements for the year 2003 and related periodic reports
after the close of trading today, with such filing being publicly available early Tuesday morning
on the EDGAR system for filings made with the U.S. Securities and Exchange Commission. When the
filing is completed, the Company will issue a press release and will hold a media conference call
at 9:00 a.m. ET on January 11, 2005, the details of which will be communicated prior to the call.
At a later date, Nortel plans to hold an investor call in conjunction with the filing of its 2004
year end results. ************************ About Nortel Nortel is a recognized leader in delivering communications capabilities that enhance the human
experience, ignite and power global commerce, and secure and protect the worlds most critical
information. Serving both service provider and enterprise customers, Nortel delivers innovative
technology solutions encompassing end-to-end broadband, Voice over IP, multimedia services and
applications, and wireless broadband designed to help people solve the worlds greatest challenges.
Nortel does business in more than 150 countries. For more information, visit Nortel on the Web at
www.nortel.com. For the latest Nortel news, visit
www.nortel.com/news. Certain information included in this press release is forward-looking and is subject to
important risks and uncertainties. The results or events predicted in these statements may differ
materially from actual results or events. Factors which could cause results or events to differ
from current expectations include, among other things: the outcome of Nortels independent review
and planned restatement or revisions of its previously announced or filed financial results; the
resolution of the accounting issues announced on November 11, 2004, including the outcome of
discussions with the United States Securities and Exchange Commission; the impact of the management
changes announced on April 28, 2004 and August 19, 2004; the impact of the inability to meet
Nortels filing obligations on support facilities and public debt obligations; any potential
delisting or suspension of the Companys or NNLs securities; the adverse resolution of litigation,
investigations, intellectual property disputes and similar matters; the sufficiency of Nortels
restructuring activities, including the work plan announced on August 19, 2004 as updated on
September 30, 2004, including the potential for higher actual costs to be incurred in connection
with restructuring actions compared to the estimated costs of such actions; cautious or reduced
spending by Nortels customers; fluctuations in Nortels operating results and general industry,
economic and market conditions and growth rates; the communication by Nortels auditors of the
existence of material weaknesses in internal controls; Nortels ability to recruit and retain
qualified employees; fluctuations in Nortels cash flow, level of outstanding debt and current debt
ratings; the use of cash collateral to support Nortels normal course business activities; the
dependence on Nortels subsidiaries for funding; the impact of Nortels defined benefit plans and
deferred tax assets on results of operations and Nortels cash flows; Nortels dependence on new
product development and its ability to predict market demand for particular products; Nortels
ability to integrate the operations and technologies of acquired businesses in an effective manner;
the impact of rapid technological and market change; the impact of price and product competition;
barriers to international growth and global economic conditions, particularly in emerging markets
and including interest rate and currency exchange rate fluctuations; the impact of rationalization
in the telecommunications industry; changes in regulation of the Internet; the impact of the credit
risks of Nortels customers and the impact of customer financing and commitments; stock market
volatility generally and as a result of acceleration of the settlement date or early settlement of
Nortels purchase contracts; the impact of Nortels supply and outsourcing contracts that contain
delivery and installation provisions, which, if not met, could result in the payment of substantial
penalties or liquidated damages; and the future success of Nortels strategic alliances. For
additional information with respect to certain of these and other factors, see the most recent Form
10-Q/A and Form 10-K/A filed by Nortel with the SEC. Unless otherwise required by applicable
securities laws, Nortel disclaims any intention or obligation to update or revise any
forward-looking statements, whether as a result of new information, future events or otherwise. -end- *Nortel, the Nortel logo and the Globemark are trademarks of Nortel.