My accountant has QB 2018 for Windows. I have QB 2020 for Mac (V19.0.11 R12). When I export my business for Windows he cannot read the file and gets error code -1.0. I realize we are talking about different versions and platforms separating the products but this has worked in the past. Last year I paid QB $125 to fix a corrupt file but there is no indication this year that that is the problem. QB tech support suggests that the problem is that QB 2018 for Windows is no longer a viable product.