Microsoft CELA, Heuking, and GSK Stockmann — Enterprise Deployment at Scale

Three large-organization deployments reported this week illustrate what full-scale legal AI adoption looks like in practice: Microsoft's 2,000-person CELA legal department is using Harvey across legal and compliance operations; Heuking expanded Harvey to all professional groups firmwide on August 5; and GSK Stockmann and Bruchou & Funes de Rioja are running live M&A due diligence transactions on Harvey, reporting 15–20% time savings on structured data rooms and up to 75% on unstructured document sets. For managing partners at mid-sized firms who are still in the "pilot for selected practice groups" phase, these case studies define the competitive reference point: their large-firm and large in-house counterparts have moved from pilot to firmwide deployment to documented ROI in the same timeframe that mid-sized firms have been managing procurement. The lesson is not to rush to deployment, but to structure pilots with pre-agreed success metrics, C-suite sponsorship, and a defined path from pilot to expansion — which the Legal Stack report identifies as the distinguishing characteristic of pilots that convert.