You have Eudora 18.104.22.168 paid mode. It has repeatedly locked up your system, and their support has been unable to solve this problem. At this point, repeated hard rebooting your system has caused Eudora to stop functioning.
When you start Eudora, all those messages in an inbox show a question mark in a status column. It gave you an error message on one of your other inboxes with a .mbx file, so you deleted that box. Is there some way you can get Eudora to perform a database integrity check or something?
You deleted that errant mailbox and compacted some other mailboxes. You can check out this missing mail / corrupt mail article for Eudora support. It was for a specific error but I think this symptom is similar to yours.
Make sure to backup your existing mailbox files first, as those instructions specify.