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Im not sure what the heck happened about a month or so ago, and I have still not resolved it. I did check on thing that was suggested to me, but it didnt really make much of a difference. After an update at about that time, my email folders I made appeared all wacky in the sense that some folders were grayed out, but still retained subfolders (with their contents) in them. I dont know what that means or why they are grayed out. I also noticed a bunch of folders named Userfolder with a number after that. They contain many emails in each one, like they were removed from the original folder they were in. So I dont know, for most of them, what folder I had them in. Im thinking I can try and match them to the grayed folder they might belong to, but not sure on where some go. I have no idea why this happened, and I have been trying to use Thunderbird since then. Im attaching a photo of what part of my Thunderbird, folders & grayed out folders look like. I just want to know how to correct this and get things back in order. I dont know if I did something in the settings or what. Plus this was over a month ago. Ive just been using my yahoo mail account on the web.

I have been using emails without problem until recently but since a few days ago, it suddenly happened that I now cannot attach files. I have reinstalled software but still I cannot. I was asked to ask email provider so I asked nifty but they have not responded. Another issue, after reinstalled software, description is now shown in English. I can understand it but I would like to know how it can change to Japanese. I would appreciate very much if someone can help to solve this issue. Thank you very much. redacted@nifty.com

Hello,

I urgently need technical assistance with a serious issue involving Mozilla Thunderbird and my professional certified email account (Aruba PEC, Italy).

I have been using Thunderbird to manage my professional email correspondence for several years.

I organize processed emails into yearly folders (2024, 2025, 2026, etc.), located under my email account in Thunderbird, not under Local Folders.

Today, October 13, 2026, I discovered that all emails dated January through September 2026 have disappeared from my "2026" folder.

Only emails from October 2026 remain.

The missing messages include professional correspondence, certified email delivery receipts, acceptance receipts, and potentially legally significant communications.

What I have verified so far:

The "2026" folder exists both in Thunderbird and in Aruba Webmail.

Both display the same remaining emails from October.

The Trash folder is empty.

The 2024 and 2025 folders still contain their messages.

Thunderbird's retention settings are configured to "Don't delete any messages."

The "2026" folder inherits the account's retention settings.

I did not knowingly delete or move these messages.

Aruba customer support informed me that they cannot restore the missing emails.

I checked Windows Previous Versions and OneDrive, but no backup was found.

I located the local Thunderbird mailbox file named "2026" in the profile's ImapMail directory. It is approximately 3 MB.

Inspection of a copy of this file did not reveal message headers from before October 2026.

I could not find another larger copy of this mailbox file in the Thunderbird profile.

I occasionally remove unused folders under "Local Folders", but I do not recall deleting any folder containing these messages. The affected "2026" folder is located under the IMAP email account.

My questions are:

Could Thunderbird have deleted or moved these messages automatically despite the retention settings?

Could IMAP synchronization, folder corruption, message filters, or compaction explain this situation?

Are there any additional Thunderbird files, caches, databases, or recovery methods worth investigating?

Is there any way to identify when or how the messages were deleted?

What steps should I take to prevent further data loss?

I have preserved a backup copy of my Thunderbird profile and would prefer not to perform potentially destructive operations.

This is particularly serious because the missing messages are part of my professional and legally relevant correspondence.

Any technical guidance would be greatly appreciated.

Thank you very much for your help.

WHY HAS A CERTIFICATE BEEN DENIED ON MY THUNDEREBIRD ACCOUNT..HEAPS OF EMAILS HAVE BEEN STUCK IN LIMBO...WHY?

jOHN BREHENY EMAIL ---[redacted from community support forum] @aussiebroadband.com.au please reply to my questions??

I have been using Thunderbird for years. My current version is 158.0 (32-bit). In recent months Thunderbird has become increasingly weird and annoying. These problems have occurred individually, not all at once, and each persists--that is, they are all and always present.

1. T'bird's counts of messages in folders is always much higher than the actual counts. 2. I tag messages with color, but T'bird deletes the color tags within a day. 3. Clicking a message doesn't change the message from Unread to Read--that is, the title stays bold. I can change the read/unread indication by clicking the button, but the change doesn't happen automatically. 4. If I drag a message to my wife's T'bird inbox, the act removes the message from my T'bird inbox, but it doesn't always remove it from the inbox at the Server. 5. Deleting a message from my T'bird inbox often also deletes the message just above it. This is the oldest problem, and when it first occurred I found that if I closed and immediately reopened T'bird the message would reappear in my T'bird inbox. Now it does not, although the message might still be in my inbox at the Server. 6. While I am reading a message, the list of messages often pops up to the top (oldest) message. The message I was reading doesn't disappear or otherwise change, but I have to scroll back down to it and click it again in order to delete it or move it to another folder.

These problems are more than annoying. Can anybody help?

I drag messages from Thunderbird's Sent folder into subfolders under Thunderbird's Gmail account but when I log into Gmail directly the messages have not moved out Gmail's Sent folder even though the tags show the subfolder where they should have been placed. What can I do to have those messages appear in subfolders as they do when I am in Thunderbird?

When I transfer messages from an on-line email account to a local folder, they do not display in the local folder. Activity manager states the messages have been transferred.

Hello,

I would like to understand how to configure Thunderbird with IMAP accounts so that moving messages to Local Folders automatically removes them from the mail server.

I am currently experiencing this issue with Gmail.

1. Manual message moving

When I manually move an email from the Gmail Inbox to a Thunderbird Local Folder, the message is successfully moved locally. However, on the Gmail server, the message remains in the Inbox and is marked as read instead of being deleted.

2. Automatic message filters

I have configured message filters in Thunderbird to automatically move certain incoming emails to Local Folders.

The messages are successfully moved to the specified Local Folders, but instead of being deleted from Gmail, they appear to be archived and remain on the server.

Expected behavior:

- When I manually move an email from an IMAP folder to a Local Folder, it should be removed from the mail server. - When a message filter moves an email to a Local Folder, it should also be removed from the mail server. - Messages moved to Local Folders should retain their original read/unread status.

My questions:

1. How should Thunderbird be configured to achieve this behavior? 2. Are there specific settings for deleting messages from an IMAP server after moving them to Local Folders? 3. Does Gmail require additional IMAP configuration to ensure that moved messages are actually deleted rather than archived? 4. Is there a recommended way to configure message filters for this purpose?

My goal is to use Thunderbird Local Folders for storing emails while removing the original messages from the Gmail server to free up storage space.

Thank you for your help.