Connectria Provides Comprehensive Managed Hosting Services For Ameren Corp.'s Website

ST. LOUIS, MO (December 26, 2003) - Connectria Corporation today announced that it has been awarded a multi-year contract to provide 24/7 high availability hosting services for the corporate web infrastructure of Ameren Corp. Ameren's web infrastructure includes approximately twenty (20) Microsoft Windows servers running Microsoft .Net applications, IIS, and SQL Server databases among other applications and technologies. Ameren will leverage Connectria's advanced Internet and data center infrastructure, as well as its expertise in IT infrastructure technologies from IBM, Lotus and Microsoft. Connectria is a Premier IBM/Lotus Business Partner and a Microsoft Certified Solutions Provider.

About Ameren Corp.
With assets of $14.7 billion, Ameren Corp. (NYSE: AEE) owns a diverse mix of electric generating plants strategically located in its Midwest market with a capacity of more than 14,600 megawatts. Ameren serves 1.7 million electric customers and 500,000 natural gas customers in a 49,000 square-mile area of Missouri and Illinois.

About Connectria
Connectria is a profitable and growing global provider of complex hosting and managed hosting services. Connectria offers an array of hosting services for companies of all sizes across a wide range of technologies, including Enterprise Applications, Software as a Service (SaaS), HIPAA Compliance Support, Data Center Outsourcing, Disaster Recovery and Cloud Computing. A privately held company, Connectria has built its business through reinvesting profits and without equity financing. Connectria operates world-class Data Centers, Network Operations Centers, and Engineering Centers located in St. Louis, Missouri and Philadelphia, Pennsylvania. From these facilities, Connectria operates as a virtual extension of its clients' IT organizations.

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