Correct. Different backups have different folders. Pre-Catlina there was a V5 folder and a year prior there was a V4 folder neither of which is in my current mac. However there is a V2 folder that is still lingering.
It looks like when there is a new OS release they move the subfolders into a new folder with a higher V, leaving the older folders with just a MailData folder and an Accounts.plist file.
I tried copying the V4 and V5 folders's MailData folder and an Accounts.plist file from the backups to my mac but it did not rectify the problem. Do you have any suggestions as to how I might rectify this?
Thanks