For everyone who owns the Oxford English Dictionary on CD-ROM, 2.0 or higher, an upgrade 4.0 is available! The upgrade software is compatible with Windows only and your previous version Data CD will be required for validation during installation of the v4.0 software.The Oxford English Dictionary is the internationally recognized authority on the English Language, defining more than 500,000 words and tracing their usage through 2.5 million quotations from a wide range of literary and other sources. The text on the CD-ROM comprises the full text of the OED 2nd Edition , plus the three Additions volumes, as well as 7,000 new entries from the OED's continuing research.Most importantly,OED v4.0 on CD-ROM boasts superb search-and-retrieval software, designed specifically for the electronic version, enabling you to investigate the Dictionary in ways not possible with the print edition. Questions which might have taken years of patient research can now be answered in seconds.System RequirementsFor users of version 2.0, 3.0, 3.1 and 3.11. Windows: Intel Pentium 4 1.6GHz processor or equivalent (2GHz recommended); Microsoft Windows Vista, Windows XP, Windows Server 2003, Windows 2000; 512MB of RAM; 1Gb free hard disk space; minimum monitor capability: 1024 x 768 pixels and high color (16 bits per pixel, ie 65,536 colors); local CD-ROM/DVD drive (for installation); runs from hard drive only.