The information in this article applies to: 
 SUMMARYCustomers that purchase the Microsoft Windows operating system version 3.1 upgrade edition directly from Microsoft will not receive a registration card because they are already registered users of Windows. MORE INFORMATIONThe version of Windows 3.1 available in retail stores includes a registration card. Customers unsure of their registration status should call Microsoft Sales Information Center (MSIC) at (800) 426-9400. Additional query words: 3.10 3.11 
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