Thunderbird Community Forum

May 25 2026. A few days ago, Thunderbird upgraded me to Release 151.0. I can no longer send or receive emails.

My wife has been upgraded to ESR 140.11.Oesr, and she has no problems.

I do not want to go through the tests of removing virus guard etc to try to make 151.0 work, so I would like to move to ESR 140.11, but cannot find online how to do that?

Please help.

I'm currently running Thunderbird 140.9.1esr and it shows an update available to version 140.10.0esr. However, when I click on the update button, it shows "downloading" but it stays at 0 bytes and will not download the update. All previous updates to my current version automatically downloaded and installed after I clicked on the update button. How do I fix this or is there a problem with 140.10.0esr? Thank you!

Now I have Tbird running on my Android with all my email accounts in it. However; my PC version (Win 11) is like a first install. Blank slate. It asks about some "Hub" thing and I don't understand exactly what it is asking for. Outlook name and password? Mozilla account name and password? Some other username and password? Can't transfer anything from mobile to PC (not good). Any way to fix this? Don't tell me I might have to go back to Outlook...

Every time I let Thunderbird update, the format changes to a previous format and my emails and folders are gone.

Having to call my contacts to have them send these receipts again is frustrating. Setting up new folders AGAIN is frustrating.

I have thought of contributing to you, but this behavior is beyond infuriating and costs me hours and hours of time to fix.

How can I get consistency? How can I retrieve what is lost? The only thing I know to do is to STOP letting you update my program.

Not a happy camper.

After running an update, when launching Thunderbird it says "Your computer must be restarted to complete a previous upgrade of Thunderbird. Do you want to reboot now?". Rebooting does nothing, I'm prompted with the same message. Tried re-installing the latest version - it gives me the same error message before re-installying, and also un-installing the version I have on my PC - it also prompts me to restart to finish the earlier upgrade.

Hi, I will just open with a notice to Mozilla - I would happily donate to your work IF..... There are a number of irritating features I encounter using Thunderbird but one of the most infuriating is that when updating, any message tabs that were previously open disappear - when surely it must be possible to locate these in a straightforward data file somewhere - ready to populate automatically or even manually would be appreciated? At least, Firefox, after a bit of searching does keep a list of history..... but who wants to open ALL tabs in any period of history regardless of whether they were open when the update occurred.

Colours of anything and everything could be varied to speed up and simplify use? Server settings are all over the place... taking longer to enter/locate and edit than they ever should..... seeing a list of every setting inside a postage-stamp box without being able to even see much of it - after all these years surely you can over-rule Microsoft? Avoid kowtowing to monopolies!

I must get on with proper work so will stop moaning now... but my first line stands - get things professional and smoother with greatly increased options and I'll (probably like many others) be keen to give financial support!

Warmest wishes, Tom

So, updated from 147.x to 148.0 this morning 9Win 11 Pro), and didn't take me long to realize that the upgrade nukes Google calendaring using Provider. With 148, if I look at the calendar, 100% of the entires are 'missing'.

If I (i) unsubscribe from the calendars, (ii) uninstall Google Provider, (iii) re0install Provider and re-authenticate, (iv) re-subscribe, then calendar entries are shown.

But...if I turn off TB, and turn it back on again, calendar entries disappear.

Note this is only an issue with 148.0. On my other machines (which largely run 140.x), not a problem.

Every 2 or 3 days, Thunderbird tells me it needs to be updated. I run the update but halfway through it stops and tells me that I have a newer version on my PC. Why can it not recognise that I am up to date?