Tad O~

I have been running Thunderbird for many years, currently on a Windows 10 PC, and always been pleased with its performance. Using it to monitor 5 email accounts, each on a separate folder. Recently I noticed that on three of the accounts extra folders are appearing named inbox-1, inbox-2, inbox-3... then inbox-5 appeared today. There is also inbox.msf.compact-backup and a couple of nstmp folders. They contain copies of all emails in the main inbox over differing periods but going back to 2016 when it was first loaded. I assume this is something to do with compacting but why has it started it doing now and how do I get rid of these folders which are, presumably, duplicating all my messages and taking up disk space. Regards, Tad O~ Thunderbird ver 128.2.2esr POP3