Hi,

> An error occurred during a connection to imap.aol.com:993.
>
> Peer attempted old style (potentially vulnerable) handshake.
>
> (Error code: ssl_error_unsafe_negotiation)

That explains it! TorBirdy is preventing Thunderbird from connecting
to imap.aol.com because it does not support secure renegotiation [1]:

    $ openssl s_client -connect imap.aol.com:993
    ...
    Secure Renegotiation IS NOT supported

More information about this setting including instructions on how you
can configure TorBirdy to allow you to connect to servers like AOL
which don't support renegotiation is available [2].

[1] - https://wiki.mozilla.org/Security:Renegotiation
[2] - 
https://trac.torproject.org/projects/tor/wiki/torbirdy/preferences#Security

-- 
Sukhbir
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