Credit where due, spreadsheet applications were already established AND bundled into suites by the time Microsoft got around to leveraging their market position to make Office the de facto standard. But, yeah, I owe most of my career to making real web apps out of badly designed, hard to use, vile to share, yet somehow better than nothing Excel workbooks. Even with all the modern trappings, and besides specific applications like Photoshop or CATIA, you could probably still run a company on just email and Excel, because people will make Excel do whatever they need, no matter how lumbering the monster becomes.