I was looking into transferring, migrating and importing some of my Microsoft Outlook .PST files / emails into Thunderbird which is on my Linux Ubuntu Desktop (Precise 12.04). Here are a few simple steps in getting it done.
These are the steps I followed for successfully importing mails from Outlook to Thunderbird.
apt-get install thunderbird
2. Install Readpst for converting pst to mbox.
apt-get install readpst
3. Convert Pst to Mbox using below command.
readpst -r Desktop/outlook.pst
(If your Outlook.pst is on desktop otherwise give proper path.)
4.Install Import/Export thunderbird addons
5. Import converted Message.
Go to Tool>Import/ExportTools>Import Mbox File.
Now You Have successfully Imported Outlook messages to Mozilla Thunderbird .