Microsoft Windows NT Workstation 4.0 SP4 Retail English CD Kit is a software product offered by Microsoft. This operating system is designed for use with Microsoft Windows NT and comes in CD format with English language support. With a retail license category, this product is ideal for individuals looking to upgrade or re-install their operating system with the latest service pack available. The Microsoft Windows NT Workstation 4.0 SP4 offers stability, security, and performance for users of the Windows NT operating system. The item is brand new, still in shrink wrap, never been used. There is some black marker writing on the shrink wrap.