Hi, I'm trying to help a friend to transfer Thunderbird to a new PC. The old PC is running Windows 10 and I have updated the Thunderbird version prior to attempted transfer. The new PC is running Windows 11. I have followed all the online instructions regarding moving profiles from one PC to another. He has two email addresses in Thunderbird, one being gmail. He has also created a number of folders into which he has neatly saved incoming emails. Each time I copy the existing profile (over 10gb) and transfer this to the new PC as per instructions, there are missing folders which don't appear to have been transferred successfully. All his emails appear to be there as well as his address book but there are several missing folders containing important emails. His created folders are in alphabetical order but the only ones transferred successfully are the ones beginning A to C. All the rest of his folders D onwards have not appeared. I'm finding this very frustrating and would appreciate any help and support. I'm not too tech savvy but can usually overcome issues like this. Should I try the export/import route to transfer all his emails and folders to the new PC or is there something else "profile related" that I could try. Thankyou very much.