Yup. I built a networked invoice database with FileMaker Pro (2.1??) on Macs at a university in the 90's. It was still there when I went back a few years later,

Yup. I built a networked invoice database with FileMaker Pro (2.1??) on Macs at a university in the 90's. It was still there when I went back a few years later, running on an ancient Mac server with an external hard disk duct taped to the top. It had just enough functionality that the department could keep track of how the monthly budget was going while the month went on, as the official Oracle Financials system could only tell you once it was too late. Later, I realised that it had a Y2K bug in it, but oh well.