Q. How do I replace lost, broken, or missing Microsoft software or hardware?

Microsoft Knowledge Base Article 326246 contains the following summary:

This article describes how to contact Microsoft for help with the following issues:

Note The current owner must be in possession of the product and be able to provide proof of purchase of all products when making requests for replacements through the Supplemental and Replacement parts team. The Supplemental Parts team provides service for the United States (U.S.) and Canada only. Submit all foreign replacement part and service pack issues to the appropriate local subsidiary.