ID-WSF1 was interoperability tested[1] among several vendor implementations, which received certification from the Liberty Alliance.
Perhaps the only significant adoption was by France Telecom and the French government's Mon Service Public.
Liberty Alliance proceeded to create an improved version, the ID-WSF 2.0 in 2006, which included harmonization with certain WS-* technologies, such as WS-Addressing and WS-Security.
ID-WSF 2.0 interoperability certification was participated by several major league vendors, as well as by startups and open source projects.
ID-WSF 2.0 interoperability certification by Liberty Alliance was accomplished by several vendors, including some open source.