"The ban caused Armstrong and others to leave Ericsson.[6] The implementation was open sourced at the end of the year (1998).[3] The ban at Ericsson was eventually lifted, and Armstrong was re-hired by Ericsson in 2004.[6]"
It is really hard to imagine that you made that excerpt in good faith. Read the very next sentence in the article.
"Shortly thereafter, Erlang was banned within Ericsson Radio Systems for new products, citing a preference for non-proprietary languages. The ban caused Armstrong and others to leave Ericsson"
Not exactly a strong endorsement for Erlang.
[1] http://en.wikipedia.org/wiki/Erlang_(programming_language)