The Microsoft Office Professional Bookshelf Windows 95 Big Box Complete USED is a vintage operating system CD set designed for Windows operating systems. It includes the necessary components to run on a computer with a minimum of 8 MB of RAM and 40 MB of hard drive space. This product is ideal for those looking to experience the features and capabilities of Windows 95 with the added functionality of Microsoft Office Professional. It is a valuable addition to any collection of software for retro computing enthusiasts.