re :''Backups kept with MozBackup'' This is somewhat risky. Suggest you create a backup as follows. Exit Thunderbird. Assuming you are using Windows OS and have profile in the default location: Access : C:\Users\<Windows user name>\AppData\Roaming\'''Thunderbird''' Copy the 'Thunderbird' folder to an external device to use as backup. Move all emails from the pop account folders into your 'Local Folders' mail account to ensure continued visibiliy and access to emails. Remove the pop account: * Right click on pop mail account and select 'Settings' * Click on 'Account Actions' * Select 'Remove Account' * click on 'OK' Now you can create a new existing mail account but this time set it up as Imap. * 'Menu icon ' > 'New Message ' > 'Existing mail account' * Enter Name * Enter email address * Enter password * select option to save password * click on 'Continue' Thunderbird will check for configuration settings make sure the 'Imap' option has been selected.