Most mid- market companies aren't running one system. They're running eight - a CRM, an ecommerce platform, a shipping tool, a couple of spreadsheets that never quite got replaced - all connected to the ERP with whatever integration got built when that particular need came up. That's usually how it starts. It's rarely how anyone planned for it to end up. It's worth being clear about what kind of ERP we're talking about here, because the answer changes everything downstream.