Comment 34 for bug 297301

(In reply to comment #33)
> (In reply to comment #15)
> > Thunderbird "losing" passwords to mail accounts has been happening to my wife
> > and me in probably every version of TB we've had, including 2.0.0.9. just now.
> >
> > It seemed to be precipitated when I attempted to open an email for reading
> > while TB was attempting to check my wife's account for new mail.
> >
> > The pop-up box asking for a password opened. I canceled the box and on checking
> > the passwords in tools/options/privacy/passwords, my wife's was no longer
> > there, so had to add it again.
> >
> > We don't use a master password.
> >
> > Detlef Pelz
> >
>
> FWIW, we haven't encountered this bug in a log time now -- perhaps not since
> 2.0.0.9. We're using TB 2.0.0.14 at present. Our mode of usage hasn't changed,
> except maybe in that we use TB more frequently since I last wrote, so it looks
> to us like the bug is fixed.
>
> Our thanks to the fabulous TB crew!
>
> Detlef Pelz
>

This bug is certainly *NOT* fixed. You are most likely not experiencing the problem because the mail server you are using is not producing any errors. Use TB with GMail + imap and you will see the problem within a day or two.