Step-by-step tutorial:
How to export email from Thunderbird to Outlook

Note that this tutorial uses screen shots from Aid4Mail Professional. You may notice slight differences if you are using Aid4Mail Home or Aid4Mail eDiscovery but generally the interfaces are very similar.

Step 1: Download and install Aid4Mail

If you don’t already have Aid4Mail, you can download it for free. Simply run the downloaded setup file (Aid4Mail_Setup.exe) to install Aid4Mail.

Aid4Mail operates in trial mode until a license is purchased and the product is activated. In trial mode, all features are available but with the following limitations:

  • A trial mode screen is displayed for 8 seconds each time you start Aid4Mail.
  • Processing is limited to a maximum of 50 messages per mailbox.
  • A numbered trial tag is added to the subject line of exported messages.
  • If you need to run performance tests on an unlimited number of emails during trial mode, add the /NoLimit switch to your Aid4Mail command line. Using it removes the 50 emails per folder trial limitation. Instead Aid4Mail replaces all exported subject lines with a trial notice.

These limitations are removed once you purchase a license and activate Aid4Mail.

Step 2: Choose which version to test

If you are running Aid4Mail in trial mode, then on the “Welcome” screen you can select which version of the software to test. Select either “Aid4Mail Home”, “Aid4Mail Professional”, or “Aid4Mail eDiscovery” from the “Test Edition” drop-down list. For this tutorial we are using Aid4Mail Professional.

Step 3: Choose the mail source format

On the Mail Source screen, select Mozilla Thunderbird in the list, then tick the “Search for mail location” box, and click the Next button.

export Thunderbird to Outlook step 3
Export Thunderbird to Outlook step 3

Step 4: Select the mailboxes to process

If Aid4Mail finds the location of your Thunderbird mail, you will see “Local Folders” in the Explorer list. Make sure the “Include subfolders” box is ticked before clicking Next. Skip the Filter Options screen if you are using Aid4Mail Professional or Aid4Mail eDiscovery.

export Thunderbird to Outlook step 4
Export Thunderbird to Outlook step 4

Step 5: Choose the target program or mail format

We will select the “Office Outlook PST file” option in this example. However, if you have Aid4Mail Professional or Aid4Mail eDiscovery, you may prefer to choose the “Email Profile” option instead to export your mail to an Exchange account or to your default Outlook profile.

export Thunderbird to Outlook step 5
Export Thunderbird to Outlook step 5

Step 6: Define the target settings

Aid4Mail will automatically set the appropriate target folder if Outlook is installed on your computer. Choose the name for your PST file; the default Outlook profile stores email in the Outlook.pst file. If you are using Outlook 2010, Outlook.pst may be located in the “Documents\Outlook Files\” folder instead of under AppData.

Enter a name in the “Base folder” field if you prefer to separate your imported mail from existing Outlook messages. For example “Thunderbird Mail” (without the quotes).

export Thunderbird to Outlook step 6
Export Thunderbird to Outlook step 6

Step 7: Set the export options

Make sure the “Restore source mail folder structure” box is ticked. Also tick the “Append messages to target mailbox file” box if you want to add your mail to an existing PST file.

export Thunderbird to Outlook step 7
Export Thunderbird to Outlook step 7

Step 8: Export your email from Thunderbird to Outlook

This is the last screen in Aid4Mail. First, if Thunderbird is open, close it. Then in Aid4Mail, click the Start button to begin the mail export task. Aid4Mail will display progress information as it processes your source mail. On finishing the conversion, Aid4Mail will indicate how many messages it has successfully processed.

export Thunderbird to Outlook step 8
Export Thunderbird to Outlook step 8

Step 9: Find your mail in Outlook

Open Microsoft Outlook. Often the Outlook.pst file will be open by default. If not, or if you chose to convert to a different PST file, then you can open the file in Outlook through File > Open > Outlook Data File.

Browse the PST file’s folder structure until you find your converted mailboxes. If necessary, you can then drag-and-drop folders or individual messages to other locations.

What’s the next step?

If you’ve been using Aid4Mail in trial mode and are convinced it’s right for you, get your activation code now. This will remove the trial limitations and enable you to transfer all your messages to Outlook.

A single Aid4Mail license can be used to process one person's mail in total on a single computer (and Windows login account), or from one computer to another. If you need to migrate mail stored on 3 different computers, or belonging to 3 different people, then you’ll need 3 Aid4Mail licenses. You can set the number of licenses on the next screen.

Aid4Mail Home
For Private Mail Only

  •  50% discount on renewal
     Can be used for email archiving
  •  Free support (within 48 hours)

Double-check the system requirements here…

  • Operating System : Aid4Mail runs under Windows 10, 8, 7, Vista, XP, Server 2019, 2016, 2012, 2008 and 2003 or Linux in conjunction with Wine. Both Windows 32-bit and 64-bit are supported.
    Windows 2000 / NT4 / ME / 98 / 95 should work but are not officially supported.
  • Internet : Online license activation, validation, and re-activation require an internet connection (offline activation option available with Aid4Mail eDiscovery editions).
  • Hardware Requirements : 64 MB of RAM, 12 MB disk space. Pentium (or compatible) processor.


Aid4Mail supports most commonly used mail formats and webmail services.

To see a full list of the formats Aid4Mail supports, click here.

This low-cost option is for home users and students to use on email that is NOT work-related.

If you’ll be processing mail for your business, nonprofit or other organization, then you need Aid4Mail Professional.
Aid4Mail Professional is a license for professional and private individuals for use on personal or business email. It may not be used for eDiscovery or Forensics purposes.

The 1-year license can be used for email migration, conversion and archiving of personal or business mail. One license can process one person's email in total for a period of 1 year. If you need to process email for 10 people, you will need 10 licenses.

The 2-week license can only be used for email migration and conversion of one person's email for a period of two weeks. If you need to migrate or convert email for 10 people, you will need 10 licenses.

Choose Aid4Mail Professional if you need to process fewer than 20 mail accounts.
A Two-Week license is intended for a one-time email migration or conversion. It’s valid for 2 weeks from first activation. This should give you enough time to experiment and then carry out your migration/conversion.

But consider this. If you spend just a little more, you get a One-Year license that you can use for other useful tasks – like email archiving, email data searching and extraction, and more… And it’s renewable in future years with a 50% discount!
We offer big quantity discounts, but they can’t be spread over multiple orders. So make sure you buy all the licenses you need now to get the best price.

You can set the quantity on the next screen after you click on the green button.
To transfer your own mail from an old computer to a new one, a single license is sufficient. However, you can’t use an Aid4Mail license on multiple computers at the same time, as stated in the EULA.
To do this you must have a license for every person whose mail is converted, in accordance with the EULA. If not, your license will be locked automatically. Note that purchasing additional licenses later is more expensive than buying all the licenses you need together in one order.
Yes, as long as you have purchased the correct number of licenses for your clients, in accordance with the EULA. For example, to process 3 people’s mail or mailboxes stored on 3 different PCs, you’ll need 3 licenses. If your client is a company, you’ll need the appropriate license(s) to cover their needs. Once you’ve used a license for one client, you cannot transfer it to another client.
Your license will be sent by email immediately after your order is accepted. If you haven’t received it within a few minutes, please check your spam folder before contacting us.