Neelie Kroes is no lightweight when it comes to open v. closed software. She spent six years as Europe's head trust-buster, and in that time, collected billions from proprietary software makers who sought to corner the market with their closed-source wares. When she spoke, big software — and everybody else — listened. In February, Ms. Kroes moved on from chasing down monopolists, becoming the European Commissioner for Digital Agenda — the EU's lead regulator of all things information technology. If her recent comments are any indication, she intends to continue her staunch opposition to proprietary software in her new position.