Yahoo! Mail is requiring TB users to go through a procedure to continue using Yahoo! mail with its new security procedures (I think they want to make me use Yahoo! Mail direst - nuts!). I followed their procedure to 'Access email vis Thunderbird', which involves removing the account, then adding the account in order to 'automatically activate the secure sign-in method for your account.' Despite ensuring that the 'delete data' checkbox was unchecked, Yahoo! launched Thunderbird only showing the plain Inbox, without any of the sub-folders that form part of my Inbox that I use to manage and record history for various tasks/accounts. Quelle domage!! Of course, I had a back-up, so I copied the new TB profiles to a safe place (just in case), deleted it from AppData/Roaming and then copied and pasted the back-up. Result! I had my old history back. Two questions: 1) In copying back my back-up file, would I have lost the new secure sign-in data for Yahoo! 2) In copying the ''new'' data to a safe place it seemed as though it might have been large enough to still have the data 'hidden', i.e. the Inbox sub-folders were still there but not visible or accessible. Any advice welcomed, I have the feeling that things will go wrong on October 20th. Thanks