SAN JOSE, CA -- (MARKET WIRE) -- 03/10/08 -- Concentric® today announced the availability of its Perimeter Email Protection (PEP) service through its new Reseller Program to provide email security for the email infrastructures of small to mid-size businesses (SMBs). Through Concentric's Reseller Hosting Program, resellers can sell and manage PEP under their own brand, providing SMBs with an affordable email security solution that reduces overall mail volume and stops malicious email before it reaches their email infrastructure.

Businesses rely on email as an essential communications tools. SMBs have limited resources, including IT and budget constraints, often making it challenging for them to deploy and maintain a secure email solution.

"With so much at risk for business networks through email we wanted to ensure that small and medium-sized businesses have an enterprise-level spam blocker application for maintaining and securing their email infrastructures," said Barbara Branaman, president of Concentric, an email provider for over 10 years. "And we've made it easy for them to get PEP. They can either get it through their current outsourced systems integrator or VAR, or directly from us. We have had reseller hosting programs for over a decade and have designed our new white label Reseller Hosting Program to meet their need to expand the portfolio of services they can provide SMBs under their own brand."

The new Concentric Reseller Hosting Program provides enterprise-class service on a proven platform. The PEP anti spam service is fully managed, so customers receive new spam filter and anti virus features and upgrades at no additional cost. Resellers enjoy wholesale pricing while retaining the customer as their own by providing Tier 1 technical support and billing.

About Perimeter Email Protection

Concentric's anti spam PEP provides email security; spam filtering and delivery back-up for businesses that own and manage on-premise email servers. PEP prevents spam, viruses, directory harvesting, denial of service or dictionary attacks, fraud, phishing schemes, and other debilitating email bombs or attacks from reaching the corporate email server. PEP ensures that only clean, valid and properly addressed email is sent to company email servers for final delivery. By stopping spam and email-based attacks at the perimeter, PEP can reduce email load by 80 percent or more.

Concentric also announced recent enhancements to its anti spam filtering engine used by PEP. These enhancements have resulted in a significant decrease in the amount of missed spam. The upgraded spam filter performs a number of statistical analyses on inbound messages and collects pattern information on inbound spam, using that to update itself multiple times a day to stay up to date with the constant change in spam techniques. This same updating process takes reported errors from customers into account for future corrections.

In addition to validating users, PEP Filtering provides anti virus protection. The PEP delivery back-up service ensures that a company never misses a critical inbound message.

According to Michael Osterman, president of Osterman Research, "Email is mission critical for SMBs for internal and external communications. Managing email in-house can be a fulltime position, a luxury many SMBs don't have. Resellers of Concentric's PEP Service can provide SMBs with anti virus and anti spam expertise they would not have otherwise."

Concentric handles 200 million inbound messages per day, with 80-90 percent of that volume being spam. PEP customers benefit from Concentric's massive email infrastructure, so that they do not have to maintain enough email processing capacity onsite to deal with the high volume of spam or pay for the hardware, software and system administrators required to ensure their email infrastructures stay viable.

Pricing and Availability

Concentric's PEP service is available today through Concentric's new Reseller Hosting Program. For further information on PEP pricing and the reseller program, go to http://www.concentric.com or call (866) 500-9696.

About Concentric

Concentric provides hosted services and software as a service to businesses and organizations including website hosting, enterprise-class domain management, email hosting and anti spam and anti virus protection email solutions. Concentric delivers superior performance, reliability, and security and is the only web hosting service to hold a patent for its Clustered Hosting architecture. Concentric accounts are backed by a three month Satisfaction Guarantee, 24x7 customer support, and a 99.9% SLA. Concentric is a business unit of XO Communications. For more information, visit http://www.Concentric.com or call (866) 500-9696.

About XO Communications

XO Communications, a subsidiary of XO Holdings, Inc. (OTCBB: XOHO), is a leading provider of 21st century communications services for businesses and communications services providers, including 50 percent of the Fortune 500 and leading cable companies, carriers, content providers, and mobile operators. Utilizing its unique and powerful nationwide IP network and extensive local metro networks and broadband wireless facilities, XO offers customers a broad range of managed voice, data and IP services in 75 metropolitan markets across the United States. For more information, visit www.xo.com.

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For more information contact:
Donna Michaels
Loughlin Michaels Group
Email Contact
(408) 393-5575