AND more to the question - the contractor who remodeled my house in 2014 was still using some ancient DOS app, possibly running on a DOS machine or at least an emulator of one, to generate billing. Which was handed to me on paper....
(He was a good contractor, so clearly having the latest billing software is not the deciding factor in that.)
(He was a good contractor, so clearly having the latest billing software is not the deciding factor in that.)