USi Receives Microsoft's ASP Solution of the Year Award; Innovative ASP Solutions Capture Worldwide Attention

Business Wire, July 16, 2001

Business/Technology Editors

ANAHEIM, Calif.--(BUSINESS WIRE)--July 16, 2001

USinternetworking, Inc. (USi) (Nasdaq:USIX), the leading Application Service Provider (ASP), today announced that it has been honored with the ASP Solution of the Year Award by Microsoft Corp. at the Fusion 2001 Partner Conference, the largest gathering of Microsoft business partners, independent software vendors, systems integrators and resellers. The global award, presented by Ian Rogoff, Vice President of the Worldwide Partner Group at Microsoft, recognized USi's leadership in the delivery of Microsoft products via the ASP model. USi was chosen from over 750 entries for the Microsoft Certified Partner Awards in 12 award categories.

"USi continues to demonstrate an unmatched ability to deliver the industry's best enterprise ASP services built on the Microsoft platform," said Andy Stern, CEO, USi. "I am pleased by the exciting results that USi continues to realize in tandem with the Microsoft Corp. and am delighted that USi has received this prestigious commendation."

"Microsoft chooses industry leaders and innovators when selecting its Partner of the Year Award winners," said Rosa Garcia, General Manager of Worldwide Partner Programs at Microsoft. "Using Microsoft technologies as a basis, USi continues to deliver exceptional services and solutions to its enterprise clients, meeting their unique needs with the best performance and reliability available."

USi was the world's first ASP to have received multiple Microsoft ASP Certifications for multiple service offerings. Microsoft Corp. certifications received include Hosted Exchange, E-commerce, and Application Hosting. Additionally, the Company was recently named the ASP global market leader by market research firm IDC.

USi clients benefit from USi's architecture including comprehensive network infrastructure and monitoring, failover services and data centers. In addition to receiving an industry-leading Service Level Agreement (SLA), USi's clients also receive best-practices implementation, consulting, hosting, management and 24x7 client services support.

About Fusion

Initiated in 1997, Fusion is host to the largest worldwide gathering of Microsoft business partners, including Microsoft Certified Partners, independent software vendors, systems integrators and resellers. Fusion is Microsoft's most important worldwide partner event of the year and recently won the Allie Award for Best Corporate Event in 2000. Premier event sponsors for Fusion 2001 are Compaq Computer Corp., EDS, IBM Corp., Intel Corp., Nortel Networks Ltd. and Unisys Corp. More information can be found at http://www.microsoftfusion.com/.> About USinternetworking, Inc.

USinternetworking Inc., a leading Application Service Provider, delivers e-commerce and enterprise software as a service. The company's iMAP portfolio of service offerings delivers the functionality of leading software from Ariba, BroadVision, Lawson, Microsoft, Oracle, PeopleSoft, Plumtree and Siebel as a continuously supported, flat-rate monthly service via an advanced, secure global data center network. Additionally, USi's AppHost managed application hosting services provide the most advanced solutions for enterprises, software companies, marketplaces, and system integrators that are seeking a better way to deliver solutions over the Internet to their customers and end users.

Internet Managed Application Provider, iMAP, AppHost, PriorityPeering, USiGSP, USiSAN USiAccelerate, and Making Software Simple are service marks of USinternetworking, Inc. All other trademarks are the property of their respective owners. USi strategic partners and providers are publicly traded on Nasdaq under the symbols: ARBA, BVSN, CSCO, MSFT, ORCL, PSFT and SEBL.

Information in this release may involve expectations, beliefs, plans, intentions or strategies regarding the future. These forward-looking statements involve risks and uncertainties. All forward-looking statements included in this release are based upon information available to USinternetworking Inc. as of the date of the release, and we assume no obligation to update any such forward-looking statement. The statements in this release are not guarantees of future performance and actual results could differ materially from our current expectations. Numerous factors could cause or contribute to such differences. Some of the factors and risks associated with our business are discussed on the Company's Form 10-K filed with the SEC on April 2, 2001, its 10-Q filing on May 15, 2001, and in our other reports filed from time to time with the SEC.

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