Five years after launching a grand plan to lift millions of businesses into the cloud, SAP finds itself stranded on the runway. The German software giant set out in 2021 to accelerate migration of its sprawling customer base from legacy systems to a modern cloud infrastructure. But progress has stalled so badly that the company is now running roughly €2 billion short of its revenue targets, a gap that speaks volumes about customer resistance to one of enterprise technology's most hyped transformations.
The numbers tell the story bluntly. Only 39 percent of worldwide ECC customers from a total of 35,000 had bought or subscribed to licenses to start their transition to SAP S/4HANA by the end of 2024. That's barely meaningful progress in five years. SAP had promised investors that mainstream support for SAP ECC would end in December 2027, effectively forcing customers to move. But the actual uptake suggests something quite different: widespread customer defiance dressed up as inertia.
The financial implications are stark. SAP's former chief financial officer told investors in 2022 that the company would see €8.5 billion in on-premises software support revenue by 2025. Instead, 2025 delivered €10.5 billion. That gap between aspiration and reality matters more than the headline figure suggests. As customers migrate to cloud subscriptions, support revenue should have collapsed; instead it barely budged. Between 2021 and 2024, on-premises support revenue fell just 2 percent, revealing the stubborn refusal of legacy customers to embrace the promised transformation.
Why the resistance? Ask customers and the answer is consistent: the business case simply does not work. Ninety-five percent of legacy users say building a positive case to migrate requires a big effort or is genuinely challenging. This is not mere foot-dragging; it reflects genuine economic scepticism. Companies have spent decades building intricate customisations around their ECC systems to suit specific business processes. SAP's push toward a "clean core" approach—stripping out custom code to simplify cloud management—threatens to obliterate that institutional knowledge. The cost of rewiring processes across thousands of employees, retraining staff, and managing the disruption often swallows any efficiency gains promised by the shiny new platform.
The company's strategy has itself become part of the problem. SAP has shifted support deadlines and licensing models repeatedly, creating confusion. SAP rebranded RISE with SAP to SAP Cloud ERP Private Edition; while the concept remains the same—a subscription combining S/4HANA, infrastructure and support—the details have shifted. Customers already sceptical now face opaque contract terms on top of technical uncertainty.
Some larger organisations have found workarounds. Third-party support providers can help organisations extend ECC's lifespan while saving significantly on maintenance fees, though companies will lose access to SAP updates and innovations. Retail giant Kingfisher recently announced it had moved ECC to the cloud whilst maintaining third-party support, effectively circumventing SAP's push toward the company's own cloud infrastructure entirely.
Gartner projects that without acceleration, there will still be 17,000 holdouts—nearly half the ECC customer base—by 2027, and more than a third of ECC customers will remain in 2030. That projection underscores a critical reality: SAP's transformation strategy may have been sound in theory, but it collided with the actual constraints and preferences of real businesses.
For SAP, the shortfall raises uncomfortable questions about strategic execution and transparency. If the company knew five years ago that customers would struggle to justify cloud migration, why did it promise investors such aggressive timelines? If the business case has always been elusive, why did SAP spend billions promoting a strategy so few customers embraced?
There remains a complex argument here worth taking seriously. Cloud infrastructure does offer genuine advantages: continuous security patches, access to new features, reduced infrastructure costs for IT teams. Many migrations do fail when not properly planned, and that risk cuts both ways. Some customers probably should move to the cloud; SAP's infrastructure is demonstrably more modern than 20-year-old ECC installations.
Yet the gap between SAP's projections and reality also suggests something important about the limits of top-down transformation mandates. You cannot simply decree that thousands of organisations with entrenched, mission-critical systems must abandon them on your timeline. Institutional inertia has economic roots. Until SAP can build migration economics that make genuine business sense for customers with complex, customised installations, the cloud escape plan will remain grounded.