M&A Success Starts Before the Integration is Finished

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Acquisitions don’t fail on spreadsheets—they fail when customers feel lost. Here’s how to deliver value fast, even before full integration.

When Microsoft acquired GitHub, early skepticism threatened to overshadow the strategic logic. Would GitHub be absorbed into the Microsoft ecosystem? Would individual developers be sidelined? The concerns were justified. In M&A, customers don’t care about synergies—they care about how their experience changes.

Microsoft leaned in. GitHub retained its identity but gained security upgrades, deeper Azure integration, and eventually Copilot, its AI-assisted coding tool. Customers on both sides saw added value before the ink was dry on full integration. That’s the lesson: in M&A, customer experience is the first real test of success.

Too many integrations stall because teams are unclear on the “why.” According to McKinsey, a quarter of executives cite cultural mismatch as the primary reason M&A efforts underperform. A clear vision and fast, meaningful wins—like unified logins and connected workflows—can build momentum and trust.

That clarity must reach engineers, not just executives. At one internal summit, newly acquired customers shared their use cases directly with product teams. The result: alignment, excitement, and real progress. Integration became purposeful, not procedural.

Quick fixes matter. Single sign-on reduces friction. Shared documentation builds continuity. Bridging workflows through APIs accelerates adoption. These aren’t just operational tweaks—they’re early proof that the merger benefits users.

Slack’s acquisition of Senator followed this playbook. Full integration took time, but customers could immediately manage tasks across platforms. It worked so well Salesforce later snapped up Slack itself.

Ultimately, M&A success is measured not in boardrooms, but in the hands of customers. Start there.