European Committee for Interoperable Systems

The European Committee for Interoperable Systems (ECIS) is an international non-profit association founded in 1989 in order to promote interoperability and market conditions in the Information and Communications Technology (ICT) sector allowing vigorous competition on the merits and a diversity of consumer choice. ECIS has represented its members on many issues related to interoperability and competition before European, national and international bodies, including the European Union institutions and the World Intellectual Property Organization (WIPO). ECIS members include large and smaller information and communications technology hardware and software providers as Adobe Systems, Corel Corporation, IBM, Linspire, Nokia, Opera Software, Oracle Corporation, RealNetworks, Red Hat, and Sun Microsystems.
Involvement against Microsoft dominance.
Over the past years, ECIS has been actively involved in the European Commission's antitrust condemnation against Microsoft, now upheld by the European Court of First Instance in September 2007.
Ziff-Davis' eWeek comments that - 
Other complaints about Microsoft include: