I don't know if these questions are simplier or not, but I searched for answers and didn't find it.

Recently I had to format my hard disk to do a fresh install of Xubuntu. I backed up my home directory, where I stored my mail box.
Now, I want to import the mailbox files to Thunderbird, but I can't. I activate the import wizard and choose the Communicator 4.x, but the "Next" button is inactive.
What happened?

Another question is: how to import sent e-mails from Hotmail to Thunderbird?
I configured Thunderbird with an account from Hotmail and receive the Inbox mails, but I also want the Sent mails.
Can it be possible?

I also have a sub-folder in the Hotmail Inbox. Can also be possible to import mails from this folder to Thunderbird?