I am very sorry for anyone experiencing this situation and the losses it is causing business.  My only advice would be to look outside of QB for solutions, I was able to find apps that made it easier to manually migrate the missing information faster, having said that online still has limited capabilities so it may not work for what you are trying to use it for and may need to return to desktop instead.  It is unfortunate the limited capabilities are not discussed up front however.  There are some very knowledgeable QB people who are familiar with both versions and by searching and asking questions in groups like this and by asking multiple questions of other users I was able to figure out important details. You are correct in the lack of support, occasionally after calling for months I would land on a person who would spend the time to answer the questions and give the details needed to unravel the messes. Best of luck to you, my best advice is to find out if its going to work before you get any deeper into it.