[CentOS] Problems with Thunderbird

[ArcosCom Linux User]

On new CentOS 5.2 installation (and ugradation before config the diferent
programs I use), I'm having problems with Thunderbird 2.0.0.17.

Problem 1:

I configured my e-mail account (as I have in my old machine) and I have no
access to my pop3 and/or smtp servers. I write my user for the access, but
thunderbird no ask my password anytime.

Problem 2:

I installed lightning, but I can't add any new calendar to it (local or
remote).

Does anyone have these problems or knows how to solve them?

Regards