Hi What is Open-source software.... Open-source software (OSS) is computer software that is available in source code form for which the source code and certain other rights normally reserved for copyright holders are provided under a software license that permits users to study, change, and improve the software. Open source licenses often meet the requirements of the Open Source Definition. Open office is almost like MS office, you can download and use like same functions in MS office packages. - OpenOffice.org - The Free and Open Productivity Suite -------------------------------------------------------------------------------------------------------------------------------- Find more OSS for Windows from below links Open Source Windows - Free Windows software, all open-source, all Windows XP and Vista Open Source Software for Windows The OSSwin project: Open Source for Windows! Open Source Software for Windows- Suggested Applications Home | Open Source Initiative Find Open Source Alternatives to commercial software | Open Source Alternative - osalt.com SourceForge.net: Download and Develop Open Source Software for Free Regards Nilesh