If Microsofts $8.5 billion acquisition of Skype, the Internet communication company, goes through, supporters of network neutrality may be losing a standard-bearer. In Europe, Skype has been the chief litmus test for measuring the openness of mobile networks. The results so far have been resoundingly negative. Most European mobile operators block Skype from their networks or impose arbitrary charges on consumers wanting to use the free service from their cell phones. This runs counter to the concept of net neutrality, which calls for the equal treatment by networks of all Internet traffic, regardless of content.