Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, Outlook 2007
Thunderbird version 38 and newer versions
The normal Thunderbird import process requires that you have a compatible 32-bit or 64-bit version of Outlook installed on your PC. To import messages from Outlook to Thunderbird, Outlook must be set as the Default mail client. An alternative to Thunderbird's import wizard is PST Walker tool to transform pst or ost files to mbox or eml format, and then use Import Export Tools add-on in Thunderbird to import the files.
To use Thunderbird's import pst wizard, you must use an older version of Thunderbird, because the wizard is disabled for Outlook in Thunderbird version 38 and newer versions. Install version 31.8, import your data, then upgrade to the latest version of Thunderbird via the built-in update mechanism. If you do not have it installed, there are alternatives as noted below.
Whether you’re looking for a solution to migrate your emails from pst to mbox or switching to Thunderbird, there are the steps to import pst to Thunderbird.
Outlook stores your .pst and .ost files somewhere in the application data folder for your Windows user: see the Microsoft Office site for the locations for Outlook 2007, Outlook 2010, and Outlook 2013 for example. You will probably have at least two mail files, both of which will need to be imported into Thunderbird. Whether they are in PST (outlook.pst, archive.pst) or OST (outlook.ost) format depends on what type of mail server and which version of Outlook you are using.
Download and install or run portable version of PST Viewer (pstwalker.exe).
Open it, select File->Open menu to browse .pst or .ost file to open.
Select root folder in All folders pane, click the File->Export menu to convert.pst/.ost file to mbox.
Launch Thunderbird. Right click on "Local Folders" and select "Settings". Now you can see "Local directory" for your "Account Settings".
Something like this:
(You need to have allowed "Show hidden files, folders, and drives)
Quit Thunderbird. Navigate to your "Local Folders" directory in an explorer and drag and drop your mbox files in there.
Restart Thunderbird, and you should see the mailbox in your Local Folders list.
PST Walker Review
This guide explains how to open, find and extract emails from .pst files and .ost files with portable PST Viewer.
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