Where is Microsoft Corporation based?

Microsoft Corporation is based in Redmond, Washington. This location has been the company's headquarters since its founding in 1975. The choice of Redmond is significant because it is part of the greater Seattle area, which has become a hub for technology companies and innovation. This strategic location allows Microsoft access to a skilled workforce, resources, and collaborations with other tech firms and startups in the region.

The other options represent cities that are known for various business activities but do not serve as the headquarters for Microsoft. San Francisco is often associated with Silicon Valley and a multitude of tech startups, Austin is known for its growing tech scene but is not home to Microsoft, and New York City, while a financial and cultural hub, does not host Microsoft’s corporate offices.