Slack Sues Microsoft in UK Over Teams Bundling After Cloud Licensing Case Certified

Salesforce's Slack unit sued Microsoft in London's High Court on April 23, 2026, alleging Teams bundling with Office limits competition, escalating legal risks after a UK tribunal certified a separate mass lawsuit over Windows Server cloud overcharges. The cloud case, representing 60,000 businesses, seeks up to £2.1 billion ($2.8 billion) in damages for allegedly hiking prices on rival platforms like AWS while favoring Azure. Microsoft denies wrongdoing, plans appeals, and faces probes from UK CMA, EU, and US regulators; prior EC deal unbundled Teams to avoid fines. These developments amplify regulatory pressure on Microsoft's cloud and software franchises, potentially weighing on stock valuation amid competitive shifts for rivals like Salesforce (CRM.N).