128.8.0esr is the latest version of the extended support release. If you post more details on your problem, someone here may be able to assist.

How do I upgrade Thunderbird to the latest version? Version 128.8.0esr (64-bit) I tried too update the version that is an exercise in confusion.

I can no longer move emails to the folder of my choice. If I drag and drop an email into a folder it never goes there, sometimes it does nothing, sometimes the email disappears like it moved but it never ends up in the folder I drop it into, I search all the folders I have created and the email I moved is GONE! I look in the "Trash" bins I can find and the email is GONE!

Anyone?

I can no longer move emails to the folder of my choice. If I drag and drop an email into a folder it never goes there, sometimes it does nothing, sometimes the email disappears like it moved but it never ends up in the folder I drop it into, I search all the folders I have created and the email I moved is GONE! I look in the "Trash" bins I can find and the email is GONE!

Right+click the target folder, pick properties, then repair

Right+click the target folder, pick properties, then repair

Great, it deleted all the files that were in the folder, how do I get them back?

All the files are GONE!

The index file has a record of all emails stored in an mbox file. It has the headers not the actual emails themseleves, so the Message List displays them using the index. When you select an email to read, the index gets used to locate the actual email stored in the mbox file to open it and display contents of email.

If things go out of synch, the index is not matching what is actually stored in mbox file. When you preform the folder 'Repair', it only repairs the index file so it matches what is really stored in the mbox file. It does not delete emails.

If emails do not display after a Repair of the index then those emails did not exist.

One of the main reasons this may occur is due to an Anti-Virus product. It might be allowed to scan mbox files and auto repair if it finds something it does not like. The problem is this - Anti-Virus products do not understand that single mbox text file contains more than one email, so it is possible to lose everything stored in that mbox file. Anti-Virus does not bother the index file and therefore it is still possible to see a list. When you attempted to move the email from A to B, it could not move something that did not exist, so in effect looked like it dissappeared, but in reality it was already gone.

At this point I would see if the mbox files are in the Anti-Virus quarrantine so you can get it back into the profile. Also check to see if you allow your Anti-Virus to scan your profile folders. I would advise you make your Thunderbird profile folder exempt from scanning OR at the very least do not permit an auto fix - force it to ask you what to do so can can stop any attempt to fix by the Anti-Virus.

Is the account an IMAP or POP account ? IF POP, and you still have emails stored on server, it's possible to force a fresh download. Tell us if you have emails still on server and we'll post more info on how to get a download to the POP account.

@toad-hall, thanks for sharing this explanation. It's the best definition I've ever seen. :)

The index file has a record of all emails stored in an mbox file. It has the headers not the actual emails themseleves, so the Message List displays them using the index. When you select an email to read, the index gets used to locate the actual email stored in the mbox file to open it and display contents of email. If things go out of synch, the index is not matching what is actually stored in mbox file. When you preform the folder 'Repair', it only repairs the index file so it matches what is really stored in the mbox file. It does not delete emails. If emails do not display after a Repair of the index then those emails did not exist. One of the main reasons this may occur is due to an Anti-Virus product. It might be allowed to scan mbox files and auto repair if it finds something it does not like. The problem is this - Anti-Virus products do not understand that single mbox text file contains more than one email, so it is possible to lose everything stored in that mbox file. Anti-Virus does not bother the index file and therefore it is still possible to see a list. When you attempted to move the email from A to B, it could not move something that did not exist, so in effect looked like it dissappeared, but in reality it was already gone. At this point I would see if the mbox files are in the Anti-Virus quarrantine so you can get it back into the profile. Also check to see if you allow your Anti-Virus to scan your profile folders. I would advise you make your Thunderbird profile folder exempt from scanning OR at the very least do not permit an auto fix - force it to ask you what to do so can can stop any attempt to fix by the Anti-Virus. Is the account an IMAP or POP account ? IF POP, and you still have emails stored on server, it's possible to force a fresh download. Tell us if you have emails still on server and we'll post more info on how to get a download to the POP account.

Hi, thanks for the reply. I have IMAP accounts. How do I tell if the emails are located on the server?

Thanks again.

For IMAP accounts, all messages are on the server. Thunderbird downloads copies to the PC. If you delete a message, it is deleted from PC and from server.

'On the server' means what you see when you logon to your webmail acount via a browser.

You asked another question some time ago and it mentions mediacom.com, so that would be the webmail account. They may be your internet service providers web login to see account and emails.