Outlook to Thunderbird email and contacts migration

vlogg5 used Ask the Experts™
I have a client who's HDD crashed. I was able to recover all his files etc including his Outlook PST file.
I am setting up his new computer and will be using Thunderbird. Does anyone know the procedures for converting
a stand alone PST file into a format that I can import into Thunderbird? Also the procedures for importing the
converted file into Thunderbird.
if at all possible I would rather not pay for a program .
If I need to install Outlook (MS Office) on the new computer it would be nice to get a link to where I can download
a trial version.
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The easiest option might be to connect any Outlook (could be yours) to an IMAP server, and to the PST file.

Copy all the emails from the PST file to the IMAP account.

Then, connect to the IMAP account from Thunderbird, and let it sync all the emails to the client.

Finally, you can either move all those email to a local folder in Thunderbird if you want to.

Any IMAP email account would do - Gmail for example.

If there is a lot of email, it might take a while (especially if you are moving it to a remote server and back again over an internet connection), but most people have unlimited data these days, so it shouldn't matter - just set and let it run overnight or the weekend or whatever.

If the end-user is using an IMAP account already, then the above would be even easier - only one copy to do.

Jerry FreyB2B Executive


You can perform the migration process from Outlook to Thunderbird by using the manual method. Please check below references that will be helpful for you.

Lindsey SmithFreelancer

If you are looking for a complete step by step guide to perform Outlook to Thunderbird migration then you can refer this blog. This blog has explained the entire conversion process in detail:
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There are different manual methods available to convert Outlook PST files to Thunderbird. You can refer the link given below for an appropriate manual method. The steps are explained along with the screenshots.


But with my personal experience, I would like to suggest you to use a third party solution also for a quick and hassle-free solution to directly export Outlook folders to Thunderbird in just a few steps.

Thanks and Regards,
There are two possibilities for this
Firstly, go to start >> Default Programs >> Set your default program. After this, choose Outlook from the given options and click on the button of “Set this program as default”
Now, the next thing you need to do is to run Thunderbird and go to the option of “Tools” and then, click on “Import”.
Select radio button, which is next to “Mail”, then click on “Next”. Now, choose Outlook from given options and click on “Next”. Once you done that, click on “Finish” to import.
To proceed further, follow the same steps and this time choose “Address Books” or any item, which you want to import from Outlook to Thunderbird.
Now, go back to Default Programs window once again. Open it and select Thunderbird and then, select “Set this program as default”

Second, Use third party software to convert PST file to Thunderbird MBOX file format.
Shiv GuptaDigital Marketing Expert
Have a look here: http://www.psttomboxconverter.repairpst.net/ . This is a Outlook to Thunderbird converter software that can help you to import Outlook data to Thunderbird without any hassle.
E ATech Lead
I hope the above suggestion meet your requirement. However, there are multiple tools available that converts ms outlook pst to mbox, but you cannot convert your contacts into mbox file format because mbox does not support contacts.

You can import csv file into thunderbird.
You can export vcard file and import into thunderbird.


Additionally, you can check free solutions like; Kernel PST Viewer or Outlook Freeware to view and export PST to MBOX easily.

Hope this helps!
danny staevIT Head
Converting PST to MBOX is no more a difficult job. It can be done easily & confidently by third party tools available in  the market. So, for all the users who are in a need of PST to MBOX Converter tool, can rely smartly on PST to MBOX tool.
Download Software from here https://www.sysessential.com/pst-to-mbox-converter/

Manual Conversion from PST to MBOX is Difficult

As we know PST file is a data file for Microsoft Outlook and MBOX files are the data file of many other popular email clients like - Thunderbird, Entourage, Apple Mail, Mac Mail,Eudora etc.

Both files have diffrent platform and different structure for storing data. And this is why manual conversion is impossible when exporting PST files into MBOX files.

Third Party Tools can Export PST to MBOX Easily

This is the reason third party tools can help in this case. Using PST to MBOX by will work like 1..2..3... for the users.

With the help of PST to MBOX Export, users can move, migrate, convert & export PST to MBOX files with all emails, attachments, email header section. PST to MBOX tool comes with various benefits as discussed below -

  • Batch Export PST to MBOX is available.
  • Do not require MS Outlook to be installed.
  • Export PST to MBOX with attachments.
  • Convert PST to MBOX with Thunderbird.
  • Compatible with Windows OS
  • Enable drag & drop method to add PST file.


Anybody that referred to using Outlook and or Gmail didn't get any points. As per my question, neither program is available because I am working from a non functioning computer.
Jessica was the first person to point me to third party software but I found less expensive software Jessica (see below) . The software will, on the trial version, convert 16 emails so you can check and see if it works.
Breti's link takes you to another program that is the same price as my link.
Danny FYI your link takes me to a site where the "Buy Now" link is broken
Shiv your program does not convert to MBOX.
Ajit your programs either wouldn't work or are very expensive.
Thanks all for your help


Just to let everybody know, don't purchase the CubeSoft program that I recommended. They will rip you off. You pay (I used Paypal) and then nothing. No link to download no ability to communicate with them etc.


Sorry I meant cubexsoft. Don't pay for it.

As I posted above, easiest way is to just use the client.

Purchasing software to do something you already have is a waste of money, and often dangerous - such software is often aimed at 'folks' (as they would like to see themselves) who don't know any better.



Thanks Alan.

Good luck, and don't hesitate to post back (here, or a new question, which might get better visibility) if you need any further help.


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