Try pressing F5 and accept the form resending notification several times until the page loads automatically. Once it loads, click "next" and proceed without any issues. If the "too many requests" appears again, just repeat the refresh process until it lets you in.

Many thanks for your help.

Could you just confirm it's "too many requests"/clear screen using X/F5 then repeat? I have also closed down Thunderbird and opened it again a few times using the above. Nothing loads either way.

I am still having the problem above!

I have an old computer with Thunderbird on it upgraded to Windows 11. My new computer also runs Windows 11.

Would this work copying the profile from my old computer to the new one? https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer

I am still having the problem above! I have an old computer with Thunderbird on it upgraded to Windows 11. My new computer also runs Windows 11. Would this work copying the profile from my old computer to the new one? https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer

Only one way to find out! Won't hurt to try.

I have 4 emails on Thunderbird, 1 gmail,1 aol and 2 yahoo.

Before transferring the profile from the old computer to my new computer I opened Thunderbird on my old computer and it asked me for my gmail password. I entered my password and it updated all my gmails in Thunderbird no problem. Then, before I could do anything else the 'too many requests' started for the Yahoo account where the password was changed. So it looks my idea above will not work!

It looks like my only solution is to delete Thunderbird from my computer and then reinstall it. Do you agree?

I have 4 emails on Thunderbird, 1 gmail,1 aol and 2 yahoo. Before transferring the profile from the old computer to my new computer I opened Thunderbird on my old computer and it asked me for my gmail password. I entered my password and it updated all my gmails in Thunderbird no problem. Then, before I could do anything else the 'too many requests' started for the Yahoo account where the password was changed. So it looks my idea above will not work! It looks like my only solution is to delete Thunderbird from my computer and then reinstall it. Do you agree?

No. Instead, try using an app password instead of what you use for the web interface. But first, go into settings and remove the PW info for yahoo.