I am running Ubuntu 12.04. I had /home on its own drive and that drive was getting SMART warnings. I backed my data up, replaced the drive, restored, booted and everything seems OK except my Thunderbird filters. When a message comes in that has a rule to filter to a different folder Thunderbird is now raising an error: "message could not be filtered to folder because writing to folder failed". There was a bug but it is being reported as repaired on 2014-10-14. And the only platform mentioned is Windows. https://bugzilla.mozilla.org/show_bug.cgi?id=931303 Now, the messages are going to my Inbox just fine, and I can manually drag them and drop them into the folder that I want them filtered to. So I conclude that this is not a permission problem. Best I could find with Google is that Mozilla suggests that the way to go is to create a profile and move all my existing data to the new profile. http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Thunderbird This seems like a Royal pain the kester. Before I undertake this this, I thought I solicit ideas as to possible solutions that are less onerous. Thanks -- Stephen