Ubuntu :: Can't Migrate E-mails From T-bird 2 To T-bird 3?

So after installing T-bird 3, I've pointed it to my old profile folder (which had a different name), and all of the settings seemed to be imported fine: I get all the folder and all of mail accounts, and also when I check e-mail, in status bar at the bottom I see how it successfully connects to all my mail servers and checks them. However, there are a lot of issues in the process:

1. It doesn't download any e-mail (but I know for a fact that there is a lot of it)

2. When connecting to every new server, a message asking me to wait while the folder is being processed pops up. Which happens even on the mail check upon the startup when it is certain that this is the first time it check the e-mail.

3. If an indexing feature is enabled, it hangs up with a message "Determining which messages to index in Sent" or something...My total e-mail folder is about 500 MBs, so it shouldn't be that bad, right?

4. But even if that feature is disabled - and that is the most important problem - all of my folders are empty!