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Microsoft v. AT&T
Supreme Court of the United States
Argued February 21, 2007 Decided April 30, 2007
Full case name	Microsoft Corp. v. AT&T Corp.
Docket no.	05-1056
Case history
Prior	Judgment for Plaintiff, 71 U.S.P.Q. 2d 1118 (S.D.N.Y. 2004); aff'd, 414 F. 3d 1366 (Fed. Cir. (2005), cert. granted, 549 U.S. ___ (2006)
Holding
Because Microsoft does not export from the United States the copies of Windows installed on the foreign-made computers in question, Microsoft does not "suppl[y] ... from the United States" "components" of those computers, and therefore is not liable under §271(f) as currently written. Federal Circuit reversed.
Court membership
Chief Justice John Roberts Associate Justices John P. Stevens · Antonin Scalia Anthony Kennedy · David Souter Clarence Thomas · Ruth Bader Ginsburg Stephen Breyer · Samuel Alito
Case opinions
Majority	Ginsburg, joined by Scalia, Kennedy, and Souter
Concurrence	Alito, joined by Thomas, Breyer
Dissent	Stevens
Roberts took no part in the consideration or decision of the case.
Laws applied
35 U.S.C. § 271(f)

Microsoft v. AT&T, 550 U.S. 437 (2007), was a United States (U.S.) Supreme Court case that restricts the extraterritorial reach of U.S. patent law. A section of U.S. patent law, 35 U.S.C. § 271(f), lets the holder of a U.S. patent block the export from the U.S. of components that can be assembled to produce a device which violates that patent, even though the patent is not enforceable in the place where that assembly takes place. The court held that a master software disk that is exported and then used to install software at the point of assembly is not a component within the meaning of the law.

In accordance with the general principle that U.S. law stops at U.S. borders, the ruling effectively prevents holders of U.S. software patents from enforcing those patents in other countries unless they hold a valid patent there.

See also

• Microsoft litigation
• Software patent
• Patent
• List of United States Supreme Court cases, volume 550
• List of United States Supreme Court cases

External links

• Supreme Court's PDF transcript of the oral arguments in Microsoft v. AT&T
• Supreme Court 'Slip Opinion Syllabus' of Microsoft v. AT&T
• "Justices reject arguments by AT&T to hold the software company (Microsoft) liable for patent infringement on copies of Windows sold overseas." CNN report of the decision
• "Supreme Court sides with Microsoft in AT&T case". Computerworld report of the decision
• Groklaw discussion of the decision

Category:United States Supreme Court cases Category:United States patent case law Category:Software patent case law Category:2007 in United States case law