What will Thunderbird do if I delete a folder which sorting rule in Thunderbird should move message? I need an answer which actual for Thunderbird versions 40 and higher. Thanks. I have rule to move messages from Inbox to user created folder. I want to move all messages from this folder and delete empty folder. How will work work? Will stay messages in Inbox? Yes I want to stay messages in Inbox. Why can I not delete rule? There are case when I have no access to machine with Thunderbird and rule, when I use browser to manage my mailbox.