They will point out that scalability is worthless unless combined with availability, reliability, manageability and security. They're absolutely right. And they're doomed anyway.
Scalability refers to the capacity to start small and then grow big without starting over.
Its host computers can handle more work, more transactions, more users than any Windows NT system. IBM hardware and software is far too expensive and too difficult. Microsoft's opportunity isn't in the few thousand high-end systems that sit at Fortune 500 headquarters. It's in the tens of thousands of departmental and workgroup servers that connect to those central host systems. After those high-end systems are surrounded by NT servers.