Each account has the same name (e.g. both are called jones@ttt.com). The newer one was set up by accident during a conversion from Outlook. Both access the same inbox and sent mail. The two accounts show up as separate in Thunderbird and both have their own inboxes and sent mail boxes. The older one has not updated since the newer one was created, and the older one can no longer reach the server. I want to delete the old one, but am worried that it may delete the folders for the new one in the process. All of the relevant messages are still hosted on the ISP's server. Please advise whether I can do a simple "delete account" on the old account and not wipe out the new one at the same time.