Evidently, CCleaner software corrupted a file in my Thunderbird profile. I opened Thunderbird and was greeted with a create new account message. All the emails and my two accounts were gone. I chose the option to use existing email accounts. I entered the email addresses and passwords. Thunderbird now displayed the two account servers. But instead of seeing all my inbox and sent emails there were only a few. There should have been over one hundred. I navigated to the Thunderbird profile directory and found four server instances in my profile. Each instance had an Inbox and a Sent file. The file sizes suggest many emails in each file. Please see attached file folder screen capture. Therefore, I installed the import export add on to Thunderbird. I eventually was able to import messages from all of the Inbox and Sent mbox files. Import was to local folder. Then I moved the emails up into the regular profile Input and Sent folders. Then used the remove dulplicates addon. There are ImapMail and Mail folders servers listed in the profile. Each with two servers. Which ones are redundant? Which to keep? Suggestions? Regards, Ted