For your sanity, I encourage logging into your online account to reassure yourself that all the messages are there. Then, I suggest unsubscribing from Allmail. That folder causes your disk space to be doubled, your send and receive time to double, and your resource usage to be much higher. Allmail is a duplicate of all other folder.

it does not make ANY sense this post. All Mail is NOT an option, neither can you unsubscribe ONLY from this folder. Useless post. BTW I've been using Thunderbird before it was Thunderbird, when it was part of Firefox, and this weird behavior just appeared recently.

I am unsubscribed as are many others, and it is the documented suggestion from Thunderbird. The allmail folder is never needed. Just yesterday, two users thanked me for that suggestion as it improved their system performance. Good luck to you.

I've used the All Mail folder since ever, with not problems... actually I use it a lot to clean emails that take too much space... in one folder I can see all my emails, as I have a complex folder structure (more than 40+ folders)... my mail is sorted automatically by hundreds of filters... it looks like you are a pretty simple user, like most.

I stand by my statement; you do not need Allmail, but it's obvious that you prefer it. I do hope you get your problem resolved. This is the first occurrence I have seen where all messages seemed to disappear.

Is a quick filter set?

my filters are ALL customized by me... with many emails directed to one special folder, like NEWS, or ORDERS, or FAMILY

my filters are ALL customized by me... with many emails directed to one special folder, like NEWS, or ORDERS, or FAMILY

Quick filters are different from those filters. Please see the attached image.

I see what you mean... none of these filters bring back all my emails as it used to be...

The point is to make sure that no filters are active. You probably have done that.

Right click on the folder, select properties, then repair. Give it a little time.

Have you checked webmail for the messages?

Do you have a back-up?

David’s suggestions are sound. I wonder how helpful it is to 139,000 messages in one folder. But your strong preference is clear. Whatever works for you.

there is no REPAIR in my version, I did several times the COMPACT and nothing changed. yeap I gave it time... like days... as I said, I miss the possibility to see all emails in one folder, as it helps me clean up my GMail from hitting my space limit, so far I'm within the free space... actually I use only 4Mb... I keep my GMail tidy, even with 139K emails.

found the REPAIR option... yes, I've already tried this at the very beginning of trouble shooting...