Limelight Networks Renews Alliance With Microsoft to Provide Content Delivery Network for Xbox Live Gaming and Entertainment Network

Limelight and Microsoft Will Continue Providing Performance Breakthroughs to Millions of Gamers

TEMPE, AZ – September 25, 2006 – Limelight Networks, the world’s leading content delivery network for digital media, today announced it has renewed its alliance with Microsoft as the Content Delivery Network for the Xbox Live® online entertainment network on the Xbox 360™ video game and entertainment system from Microsoft. Under their agreement, Limelight and Microsoft will continue teaming to provide new performance breakthroughs to millions of Xbox gamers accessing online games, content and downloads from Microsoft and leading game developers directly via Xbox Live.

Microsoft currently utilizes Limelight Networks’ high-performance content delivery network to provide more than 1,000 heavily trafficked rich-media content library items — spanning on-demand games and other multimedia content — to its full network of Xbox Live subscribers. “Since we began partnering with Limelight one year ago, the Limelight network has confirmed its solid reputation for fast, reliable delivery of rich digital content, ensuring that our customers have a superior online entertainment experience,” said Ernie Chen, Xbox Live operations program manager at Microsoft. “The Limelight platform clearly supports the needs of Xbox Live subscribers today, and can scale with Xbox Live as we continue our rapid growth.”

“The fast-growing library of extremely popular games for Xbox Live — led by the likes of Halo 2, Gears of War as well as premium sports titles — has been key to its leadership among online game platforms,” said Erik Gabler, senior vice president business development for Limelight Networks. “We are proud to play a role in that achievement by providing the unmatched performance and reliability in content delivery that gamers have come to expect as Xbox Live regularly sets new usage records – with console downloads as high as 38 Gigabits per second as global demand soars for new gaming and entertainment content.”

Safe-Harbor Statement

This press release contains forward-looking statements concerning the company's operations and use of acquired technology and intellectual property. Forward-looking statements are not guarantees and are subject to a number of risks and uncertainties that could cause actual results to differ materially including, risks associated with the integration of acquired business operations and other risks described in the company’s quarter report on Form 10Q and other periodic reports filed with the Securities and Exchange Commission. The Company assumes no duty or obligation to update or revise any forward-looking statements for any reason

About Limelight Networks, Inc.

Limelight Networks, Inc. (NASDAQ: LLNW) provides on-demand software, platform and infrastructure services that help global businesses reach and engage audiences on any mobile or Internet-connected device, enabling them to enhance their brand presence, build stronger customer relationships, optimize their advertising, and monetize their digital assets. For more information, please visit http://www.limelightnetworks.com or follow us on Twitter at http://www.twitter.com/llnw/.

Media Contact:

Paul Alfieri of Limelight Networks, Inc.
+1-917-297-4241
palfieri@llnw.com