la 0.9 esta en Español puede que te hayas bajado la version en Ingles (tal vez por un error mio).
Que tipo de contraseña te pide ? porque el software es gratuito y PGP . Cuando te pide la contraseña ? no sera que estas dando mal los datos de IMAP o de POP ?
He buscado y encontre una clave pero creo que es para GNU, no para Windows
This file contains the PGP keys of various developers that work on
Mozilla and its subprojects (such as Firefox and Thunderbird).
Please don't use these keys for email unless you have asked the owner
because some keys are only used for code signing.
Please realize that this file itself or the public key servers may be
compromised. You are encouraged to validate the authenticity of these keys in
an out-of-band manner.
Mozilla users: pgp < KEYS
Mozilla developers:
(pgpk -ll <your name> && pgpk -xa <your name>) >> this file.
or
(gpg --fingerprint --list-sigs <your name>
&& gpg --armor --export <your name>) >> this file.
Mozilla developers: please ensure that your key is also available via the
PGP keyservers (such as pgpkeys.mit.edu).
pub 1024D/6D1ECD07 2004-09-28 Chase Phillips <
cphillip@gmail.com>
Key fingerprint = 2B75 7988 9C86 B6FA 4F31 18CD 24C4 8F80 6D1E CD07
sig 3 6D1ECD07 2004-09-28 Chase Phillips <
cphillip@gmail.com>
sub 1024g/93CDD186 2004-09-28 [expires: 2005-09-23]
sig 6D1ECD07 2004-09-28 Chase Phillips <
cphillip@gmail.com>
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.0.7 (GNU/Linux)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=A2Q3
-----END PGP PUBLIC KEY BLOCK-----
Sigue insistiendo y si surge algun problema vuelve preguntar.
Suerte