According to Nielsen//NetRatings Report

CHICAGO, IL and ANDOVER, Mass., January 4, 2001 -- CMGI, Inc. (NASDAQ: CMGI), a leading global Internet operating and development company, announced today that uBid, Inc., a majority-owned operating company and leading auction and e-commerce site, was among the top 15 e-tailers of the 2000 holiday season, according to a January 2, 2001 report by Nielsen//NetRatings.

According to the report, which factored Internet home and work usage for weeks ended November 5 through December 24, uBid.com ranked 13 in terms of number of shopping visits. *As defined by Nielsen//NetRatings, a visit is a single trip to a shopping site, including both home and work PC users.

The Nielsen report also noted that 11 of the top 15 holiday season e-tail sites cited by its measurements were that of traditional retailers, making uBid.com one of four sites listed in the report that has a pure online brand presence.

Nielsen//NetRatings Top 15 Holiday Season E-Tailers, Ranked by Total Shopping Visits (U.S., Combined Home & Work for Weeks Ending November 5-December 24)

Note: The list is comprised of online merchants, reflecting individual store brands whose primary focus is online sales, and which complete the transaction within its site. Excluded from this holiday list are sites related to travel, ticketing, auctions, financial services, and shopping aggregators, including comparison shopping sites and online malls. A visit is a single trip to a shopping site, including both home and work PC users. *For holiday season 2000, Amazon.com includes traffic from its partnership with Toys R Us. Source: Nielsen//NetRatings, December 2000

uBid, a majority-owned operating company of CMGI, Inc., is a leading online auction and e-commerce site that offers consumers and small-to-mid-sized businesses the opportunity to purchase a wide range of brand name merchandise, often at greatly reduced prices, through live-action bidding using sophisticated auction technology. The company’s Internet auctions feature a rotating selection of more than 12,000 items in each daily auction. uBid offers auctions in more than 12 different product categories, including: computer equipment, consumer electronics, home and leisure, sports and recreation, jewelry and gifts, apparel, home improvement products, art, appliances, and travel and events. In addition, consumers may participate in the new uBid Auction Exchange marketplace, in which third-party vendors and consumers list their items for auction.

With more than 1.8 million registered users, uBid is committed to providing all customers with the highest quality auction experience on the Internet and offers supplier warranties on most consumer products. uBid also meets Better Business Bureau Online standards, which gives customers the confidence and security to bid safely online. For more information, visit the company’s Web site at www.ubid.com.

About CMGI and CMGI @Ventures

CMGI, Inc. (Nasdaq: CMGI), a leading global Internet operating and development company, represents a network of nearly 70 established and emerging companies, including both CMGI operating businesses and synergistic investments made through its venture capital affiliate, CMGI @Ventures. Companies in the CMGI network span a range of vertical market segments including search and portals; infrastructure and enabling technologies; e-business and fulfillment; interactive marketing; and Internet professional services. CMGI leverages the technologies, content and market reach of its extended network to foster rapid growth and industry leadership across the Internet Economy. Compaq, Microsoft, Pacific Century CyberWorks and Sumitomo hold minority positions in CMGI.

CMGI's majority-owned operating companies include Engage (Nasdaq: ENGA), NaviSite (Nasdaq: NAVI), Activate, AltaVista, CMGion, Equilibrium, ExchangePath, MyWay.com, NaviPath, SalesLink, Signatures Network, Tallán, uBid and yesmail.com. CMGI @Ventures has ownership interests in 51 companies, including Terra Lycos (Nasdaq: TRLY), Critical Path (Nasdaq: CPTH), Ventro (Nasdaq: VNTR) and Vicinity (Nasdaq: VCNT).

CMGI's corporate headquarters is located at 100 Brickstone Square, Andover, MA 01810. CMGI @Ventures has offices there, as well as at 3000 Alpine Road, Menlo Park, CA 94028. For additional information, see http://www.cmgi.com and http://www.ventures.com.

CONTACTS:

Denise Mancini uBid Public Relations (773) 272-4562 denisem@ubid.com

Kim Robinson CMGI Public Relations (978) 684-3127 krobinson@cmgi.com

uBid and ubid.com are trademarks of uBid, Inc. All other company or product names are trademarks or registered trademarks of their respective owners.