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mozilla thunderbird accounts seem to be locked no folders are showing anymore

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I have been using Mozilla Thunderbird for many years and just today for the very first time, after I opened the laptop after a long trip, all things are working very well, with the only exception of my Mozilla Thunderbird email program, I have 3 different email accounts loaded up, normally when I open Thunderbird all subfolders are showing automatically, now I just have 3 lines - one for each account with the email address of each account and a small lock on the left side, showing each account is locked - no idea how or why - never used such a lock function - I have a lot of emails accumulated over the last 5 years, work and private and need to work with all my subfolders urgently. I can write a new email but have no access to any of the subfolders they just do not show

I have been using Mozilla Thunderbird for many years and just today for the very first time, after I opened the laptop after a long trip, all things are working very well, with the only exception of my Mozilla Thunderbird email program, I have 3 different email accounts loaded up, normally when I open Thunderbird all subfolders are showing automatically, now I just have 3 lines - one for each account with the email address of each account and a small lock on the left side, showing each account is locked - no idea how or why - never used such a lock function - I have a lot of emails accumulated over the last 5 years, work and private and need to work with all my subfolders urgently. I can write a new email but have no access to any of the subfolders they just do not show
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Chosen solution

Try this: Help/Troubleshooting, click Open Folder to open the profile in File Explorer, close TB. Delete or rename session.json and foldertree.json. Restart TB. Do the folders appear?

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The lock on the icon just indicates the account is accessed through a secure connection.

If you right-click and account in the Folder Pane, Subscribe, are all the folders unchecked?

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hi Sfhowes - many thanks for answering - if I right click and go to accounts then to subscribe I see a list of all my sub-accounts and all are checked but they do not show as usable subfolders I can now see them in the way you told me but they do not display as usual - so that I have access and can use them - please advice

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see the attachment

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Seçilmiş Həll

Try this: Help/Troubleshooting, click Open Folder to open the profile in File Explorer, close TB. Delete or rename session.json and foldertree.json. Restart TB. Do the folders appear?

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yes they do, many thanks !!