AppRiver Receives First-Ever "Customer of the Year" Award From Rackspace Hosting.

Long-term relationship brings continuous innovation to messaging technology

GULF BREEZE, Fla. -- AppRiver LLC, a leading provider of e-mail messaging solutions, today announced that it has been named "Customer of the Year" by Rackspace Hosting, Inc. (NYSE: RAX), the world's leading hosting services provider.

The award is the first of its kind and was presented to AppRiver in recognition of its exceptional reputation in the e-mail security space, award-winning spam and virus protection services and excellent customer service model. AppRiver also influences the growth and development of Rackspace's customer support model with its increasing customer count and highly-customized configuration requirements.

AppRiver became a Rackspace customer in 2002 with a single server configuration and has since grown to hundreds of servers spread throughout numerous Rackspace data centers. On any given day, AppRiver's anti-spam and anti-virus software scans more than one billion e-mail messages for more than 35,000 companies worldwide.

"AppRiver has pushed us and made Rackspace's Fanatical Support[R] even better," said Graham Weston, chairman, Rackspace Hosting. "We have grown our services to adapt to their hosting requirements. This has allowed AppRiver to remain focused on developing a high-performing messaging application and delivering expert care to their customers."

AppRiver is a software-as-a-service (SaaS) provider offering real-time security solutions to businesses of all sizes. Understanding the need to protect networks from blended multi-vector security threats, AppRiver offers businesses a comprehensive, yet affordable, subscription-based service that incorporates the latest anti-virus, anti-spam, anti-phishing, anti-spyware and Web security on the market. By trusting AppRiver to take care of today's most sophisticated security threats, companies are free to focus on strategic initiatives rather than IT maintenance.

"We truly appreciate the relationship we have with Rackspace," said AppRiver CEO Michael Murdoch. "In order to stay ahead in the SaaS security business, companies must be nimble and adapt to the needs of the client. Rackspace helps us do just that."

About AppRiver

Founded in April 2002, AppRiver - based in Gulf Breeze, Florida - is a software-as-a-service (SaaS) security provider offering secure messaging solutions to businesses of all sizes. In addition to spam and virus protection, the company provides a complete managed service for Microsoft Exchange. With more than 35,000 customers around the world - and an impressive 97 percent customer retention rate since its inception - AppRiver is one of the largest e-mail security managed service providers worldwide. In 2008, Red Herring magazine named AppRiver one of its top 100 companies to watch. The company was also named to CRN Magazine's 2007 Emerging Tech Dynamos list. For more information, visit www.appriver.com.

About Rackspace Hosting

As the world's leader and specialist in hosting, Rackspace Hosting is changing the way businesses worldwide buy IT. Rackspace delivers computing-as-a-service, integrating the industry's best technologies into a flexible service offering, making computing more reliable and affordable. A trusted partner to companies of all sizes, Rackspace enables IT departments to be more effective. Rackspace is distinguished by its award-winning Fanatical Support[R], furthering the company's mission to be one of the world's greatest service companies. Rackspace is recognized as one of FORTUNE magazine's 100 Best companies to work for, ranking number 32 on the 2008 list. Rackspace's portfolio of hosted IT services includes managed hosting (www.rackspace.com), email hosting (www.mailtrust.com) and cloud hosting (www.mosso.com). For more information on Rackspace Hosting please visit www.rackspace.com or call 800-961-2888.