I'm using Thunderbird 140.6.0esr under 64-bit LMDE (Linux Mint Debian Edition) v6.0, fully up to date with patches. Last night, Thunderbird was working justfine when I switched the PC off. This morning, when I try to collect mail, I get a dialog box with the message '''''Unable to write the e-mail to the mailbox. Make sure the file system allows you write privileges and you have enough disk space to copy the mailbox.''''' I have multiple Terabytes free on the drive, and I have gone through a full file listing and checked all the file attributes. Yes, I have write access. Just to be sure, I ran a chown against the entire ~/thunderbird directory (~/.thunderbird is a logical link) so I own ~/thunderbird and everything beneath. I also ran a fsck on the drive, and fsck gave it a clean bill of health - no errors reported. This was just a normal fsck, not including a badblocks check, although I did run badblocks against the drive when I got it new, about two months ago. I am out of ideas. I suppose I could try running TB with a sudo, but I'm not really happy with doing that routinely. Does anybody have any ideas? . Thanks, Brian.