I have been unable to retrieve my emails one of my email accounts on any of my computers. There is the usual error message Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox. Thunderbird version 128.10.1esr (64-bit) I get the same error message on my main desktop, my laptop and an older desktop I use as back up. I contacted the help desk for my ISP because I thought it might be server side problem across three computers. After extensive investigation the ISP says it doesn't appear to be on their end. Other email boxes from that ISP are not affected. There is plenty of disk space available on all three computers. I regularly cleanup the mailboxes on my laptop so it is using minimal disk space. Since I started getting the error message I have also cleaned out the other two computers' mailboxes but the error persists. All three computers have plenty of disk space available.