[jerf]

Accounting and sales is now done with software. And not only "done with software", but with increasing amounts of domain and business knowledge embedded in the software.

That's what "software is eating the world" means. It isn't just that every business needs software in some vague sense, it's that every thing the business does has software in its foundation. Accounting, sales, billing, analysis, development, logistics, pretty much everything except high-level executive vision.