No. 04-1633.

436 F.3d 461 (2006)

Paul A. DEITER; Gary Leach; Franklin L. DeJulius, Plaintiffs-Appellants, and Linda Dameron Kloth; Blaine Cox; Debra Cunningham; Eric Ferrell; Elizabeth Strickland; Rene Gonzalez; Clay Tyler; Peter Haklar; Eric S. Lazarus; Harold A. Phillips; Precision Billing Services, Incorporated; MSC Systems, Incorporated; O'Sullivan, Hicks & Patton; Carl C. Conrad; Paul L. Howard; Thomas McCaleb; Vicki McCaleb; James Woods; Leyton T. Brown; Gale Ruffin; Ryan D. Reynolds; Jay S. Quigley; John W. Redmann; Kevin Huddell; Eleaders, Incorporated; John Glase; Bruce Wright; Kbsnet, SA; Evangelos Kritikos; Walter Lorell; Renaldo Veltri; Johanna M. McWhinney; Jodi Marks; Judd Goodman; Silverware, Limited; Data Unit AG; Datacrown, Limited, on Behalf of Themselves and All Others Similarly Situated; Wayne Mims; Gravity, Incorporated; 403 West Loop 820 N; to the Rescue Comprehensive Computer Services; D's Pet Supplies, Incorporated; David Bach; The Rubbright Group; James M. Burt; Reclaim Center, Incorporated; Steven Nielsen; Raymond Pryor; Seastrom Associates Ltd; Chris Campbell; Denise Davenport; Sara Cheeseman; Ronald Rodjenski; Harold Phillips; Matthew W. O'Neill; Robert Weinke; Idy Klein; David Jaffee; Avi Mandel; South Dakota Association of Plumbing, Heating and Cooling Contractors; Johnnie Moon; Robert Lee Colebank; Bryan K. Manson; Fred Luce; Edward Michael O'Brien; Golf O'Brien Company; Cynthia M. Aikens; Clair Falgoust; Carlton Falgoust; Manual Knight; Webster T. Knight; James Rudasil; Aubrey Bernard; Geraldine Guice; William Brand Pryor; Pacific Coast Systems; Teri Gordon; Michael Shevekov; Martin Hagan; Elham Shirzai; Dawn Brandt; Donald J. Gianni; Mario Traffichini; John F. Siegenthaler; Caren M. Mccall; Larry A. Penix; Pryce M. Haynes, II; John K. Heidlage; Ryan D. Reynolds; Daniel C. Ray; GTI System Integrators; Tziri Fine; Derek M. Prentice; Kurt C. Carter; James T. Brems; Tim Appelgate; Julie Tinkham; Steven Master; Thomas Infante; Turner Corporation; John A. Supernovich; Marlene K. Supernovich; Sherwood; Automatik Design, Incorporated; State of West Virginia, ex rel Darrell V. McGraw, Jr., Attorney General; Netscape Communications Corporation; Sun Microsystems; BE Incorporated; Burst.Com, Incorporated; Ivax Corporation; Keith Cooper; Conway, Mackenzie & Dunleavy, PC; Christine Barton; Rhoda Henning; Karen Green; Renae Lucas; John Roby; John Does 1-50; Michael Lewis; Henry Mascagni; Hayley J. Gardner; Steve Grubb; Linda Stewart; Murline Addington; Travis D. Mchann, Jr.; Billy Lewis; Booker T. Bailey, Jr.; James Pigg; Angela Brinkley; Delanious Harried; Gertrude Green; Camelia Calvert; Mary Wyatt; Emma Walton; Hetha Green; Realnetworks, Incorporated; Pradeep Sujan, Plaintiffs, v. MICROSOFT CORPORATION, Defendant-Appellee.

United States Court of Appeals, Fourth Circuit.

Decided February 7, 2006.

Attorney(s) appearing for the Case

ARGUED: Daniel A. Small, Cohen, Milstein, Hausfeld & Toll, Washington, D.C., for Appellants. David Bruce Tulchin, Sullivan & Cromwell, New York, New York, for Appellee. ON BRIEF: Michael D. Hausfeld, Michael W. Byrne, Cohen, Milstein, Hausfeld & Toll, Washington, D.C.; Stanley M. Chesley, Robert Heuck, II, Waite, Schneider, Bayless & Chesley, Cincinnati, Ohio; Dianne M. Nast, Michael Nast, Roda & Nast, Lancaster, Pennsylvania; Douglas Thompson, William Butterfield, Finkelstein, Thompson & Loughran, Washington, D.C.; Frank C. Dudenhefer, Cummings, Cummings & Dudenhefer, New Orleans, Louisiana; James R. Malone, Chimicles & Tikellis, L.L.P., Birmingham, Alabama; Elwood S. Simon, John P. Zuccarini, Elwood Simon & Associates, Birmingham, Alabama; Robert A. Skirnick, Meredith, Cohen, Greenfogel & Skirnick, P.C., New York, New York; William Markovits, Markovits & Greiwe, Cincinnati, Ohio; Lynn L. Sarko, Mark Griffin, Raymond Farrow, Keller Rohrback, L.L.P., Seattle, Washington; Christopher Lovell, Lovell, Stewart & Halebian, L.L.P., New York, New York; Melissa H. Maxman, Duane Morris, L.L.P., Philadelphia, Pennsylvania; William Kerschaw, Kerschaw, Cutter, Ratinoff & York, Sacramento, California; James Patrick Ulwick, Kramon & Graham, Baltimore, Maryland, for Appellants. Michael F. Brockmeyer, Jeffrey D. Herschman, Piper Rudnick, L.L.P., Baltimore, Maryland; Richard J. Wallis, Steven J. Aeschbacher, Microsoft Corporation, Redmond, Washington; Daryl A. Libow, Richard C. Pepperman, II, Sharon L. Nelles, Sullivan & Cromwell, L.L.P., New York, New York; Charles B. Casper, Peter Breslauer, Montgomery, McCracken, Walker & Rhoads, L.L.P., Philadelphia, Pennsylvania, for Appellee.

Before WIDENER, NIEMEYER, and GREGORY, Circuit Judges.

Affirmed by published opinion. Judge NIEMEYER wrote the opinion, in which Judge WIDENER and Judge GREGORY joined.


NIEMEYER, Circuit Judge.

In this antitrust litigation, the district court entered an order dated May 27, 2003, certifying a class of consumers seeking damages against Microsoft Corporation allegedly caused by Microsoft's use of monopoly power to overcharge purchasers of Microsoft's Windows...

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