The document compares the compatibility and functionality of Windows XP and Windows Vista in a corporate environment. Various software applications were installed on virtual machines running each operating system. Most applications like antivirus software and Microsoft Office installed successfully on both. However, the Novell client central to network access and file sharing at the author's job installed on XP but not Vista. Due to this incompatibility with a critical program, the document recommends Windows XP over Vista for stable use in business environments.