[Globz]

Same here, many years ago I made a web app for our sales team and third party so they can sell/buy our products, the whole business is still powered by IBM iSeries. Basically the AS/400 is the source of truth and the web app just pulls the data couple times a day and provide a nice GUI for the users. The sales orders are automatically sent to the iSeries in batch so no more manual entries and their status are reflected back on the web app so you can have an overview of each orders. Sadly we are looking at moving away from iSeries and we will be at the mercy of whatever cloud solution that will meet our needs.