Microsoft Corp. has successfully sidestepped a potentially massive antitrust fine from the European Union by agreeing to unbundle its popular Teams video-conferencing app from the Office productivity suite, marking the end of a protracted investigation that underscores the bloc's aggressive stance on Big Tech dominance. The resolution, announced this week, stems from a 2020 complaint by Slack Technologies Inc., now owned by Salesforce Inc., which accused Microsoft of leveraging its market power to stifle competition in the collaboration software space.