Step by step guide to export MBOX files to multiple formats
Important Note: Thunderbird supports two file formats to store its emails – MBOX and Maildir. This software only works with MBOX files to convert Thunderbird data. If your Thunderbird emails are stored in Maildir format, then please use SysTools Maildir converter.
You can check the Message Store Type in Thunderbird here.
To export Thunderbird Address Book (contacts) along with emails, you can use SysTools MAB Converter along with this MBOX to PST converter. Both these software come as a bundle and can be purchased at a discounted price.
Download and install SysTools MBOX Converter, then launch it. Select Files opens first, and the left panel lists six steps, which are Select Files, Export Filter, Export Options, Export Settings, Select Destination and Processing Export.

Note: If you have purchased the activation license key, then only go ahead with the activation process otherwise you can continue with the demo version.
Click Activate in the top bar to open Product Activation. Select Online Activation if your system has internet or Offline Activation to use a key from Support. Enter your activation key and click Activate.

Product has been activated appears on screen. Click Close to return to the main screen.

Select File Mode to add single MBOX or MBX files. Select Folder Mode to add a mailbox folder.

Click Browse Files or drag and drop your files into the box.

Select your MBOX files in the Windows dialog and click Open.

Your files appear in a paged list with their sizes. Use the search icon to find a file, Add More Files to include more and Remove All to clear the list. Click Next to move to Export Filter.

Select Apply Date Range Filter to convert mail from a set period. Ranges apply on Sent Date. Enter a Start Date and an End Date, then click Add Range.

Your range lands in the table on the right. Use Remove to delete one range or Remove All to clear the table.

Click Next. Next stays off while the filter box is selected and the table has no range.

Export Options lists 10 formats, which are CSV, EML, EMLX, HTML, JSON, MHT, MSG (Outlook), PDF, PST (Outlook) and TXT. Select a format chip to jump to it, or type in Search export type. You can select more than one format.

Now select your format tab below. Every tab covers Step 6 to Step 11 for that format.
Export Options lets you select one or more formats. Every tab below covers one format from Step 6 to Step 11.
Select CSV in the Export Options list. CSV saves your email items data in CSV files. Click Next.

Click Settings to open the CSV options. Create Single CSV File for Each MBOX File combines all messages from an MBOX file into one CSV file. Export Header Properties Only keeps From, To, CC, BCC, Subject and Sent Date.

Click Next after you set your options.

Click Browse next to Select Destination Path to choose where converted files are saved. Keep enough free storage in that location.

Select a folder in the dialog and click Select Folder. Naming Convention and Delimiter stay greyed out for CSV.

Click Start Export once the destination path is set.

Export Process Completed Successfully appears. Click OK.

Export Progress shows Items Processed, MBOX Scanned and the MBOX Scan Summary with File Path, Mail Count and Items Scanned. Under Export Tasks, check Files Processed, Failed and Speed for CSV.

Click View Result to open the output folder.

Windows Explorer opens the SysTools MBOX Converter output folder. Open the CSV folder inside it.

Inside, you see ExportReport.csv, the converted CSV files and folders from your mailboxes.

Open ExportReport.csv to check where every MBOX file went and how many items converted or failed.

Select EML in the Export Options list. EML creates RFC 5322 email files. Click Next.

Settings shows No additional settings required for this format. Click Next.

Select Browse beside Select Destination Path and choose a save location with enough free space.

Choose your output folder in the Windows dialog, then click Select Folder.

Naming Convention sets your file names. Subject is the default, and other options add From, To, CC or a date.

Delimiter for Special Characters decides what replaces special characters. Choose Underscore, Space or Hyphen.

Select Start Export to begin the EML conversion.

Click OK on the success message that confirms the export.

Track Items Processed, Time consumed and MBOX Scanned at the top. MBOX Scan Summary lists every source file with its Mail Count and Items Scanned, and the EML task bar reaches 100% with Completed.

Select View Result to jump to the saved files.

Explorer shows your output location. Inside SysTools MBOX Converter, open EML.

ExportReport.csv and the MBOX Files folder hold your EML output.

ExportReport.csv lists Source Path, Destination Path, Success Count and Failed Count, so you can confirm every file converted.

Select EMLX in the Export Options list. EMLX creates files that Apple Mail opens. Click Next.

EMLX asks for no setup here, and the screen confirms it with No additional settings required for this format. Click Next.

Use Browse under Select Destination Path to set your output location. Choose a drive with enough space.

Click Select Folder after you highlight the folder in the dialog.

Select a Naming Convention from the list to control how exported emails are named.

Set the Delimiter for Special Characters to Underscore, Space or Hyphen.

Hit Start Export when your destination is ready.

Click OK when the Export Process Completed Successfully message shows.

Watch the progress bar and the MBOX Scan Summary while the EMLX task finishes. Export Tasks reports Source Folder, Files Processed, Failed and Speed.

Use View Result to open your converted files in Windows Explorer.

Open the EMLX folder within the SysTools MBOX Converter output in Explorer.

Your converted EMLX files sit in the MBOX Files folder, next to ExportReport.csv.

Check ExportReport.csv in Excel to compare Source Path with Destination Path, then scan the Failed Count column for problems.

Select HTML in the Export Options list. HTML keeps images inline and saves attachments separately. Click Next.

Leave HTML on its defaults, because no additional settings are required. Click Next.

Click Browse next to Select Destination Path to choose where converted files are saved. Keep enough free storage in that location.

Select a folder in the dialog and click Select Folder.

Open Naming Convention to name exported email files. Choose Subject, From+To+CC or a pattern that joins Subject, From, To and Date.

Open Delimiter for Special Characters to choose the replacement for special characters in file names. Select Underscore, Space or Hyphen.

Click Start Export once the destination path is set.

Export Process Completed Successfully appears. Click OK.

Export Progress shows Items Processed, MBOX Scanned and the MBOX Scan Summary with File Path, Mail Count and Items Scanned. Under Export Tasks, check Files Processed, Failed and Speed for HTML.

Click View Result to open the output folder.

Windows Explorer opens the SysTools MBOX Converter output folder. Open the HTML folder inside it.

Inside, you see ExportReport.csv and LongFilePath.csv plus a folder named MBOX Files.

Open ExportReport.csv to check where every MBOX file went and how many items converted or failed.

Select JSON in the Export Options list. JSON creates structured files with inline images and separate attachments. Click Next.

Click Settings to open the JSON options. Select Create Single JSON for each folder to create an MBOX specific folder with a JSON file for every mailbox folder. Click Next.

Select Browse beside Select Destination Path and choose a save location with enough free space.

Choose your output folder in the Windows dialog, then click Select Folder.

Naming Convention sets your file names. Subject is the default, and other options add From, To, CC or a date.

Delimiter for Special Characters decides what replaces special characters. Choose Underscore, Space or Hyphen.

Select Start Export to begin the JSON conversion.

Click OK on the success message that confirms the export.

Track Items Processed, Time consumed and MBOX Scanned at the top. MBOX Scan Summary lists every source file with its Mail Count and Items Scanned, and the JSON task bar reaches 100% with Completed.

Select View Result to jump to the saved files.

Explorer shows your output location. Inside SysTools MBOX Converter, open JSON.

ExportReport.csv and the MBOX Files folder hold your JSON output.

ExportReport.csv lists Source Path, Destination Path, Success Count and Failed Count, so you can confirm every file converted.

Select MHT in the Export Options list. MHT creates a single MHT file with embedded HTML, and attachments save separately. Click Next.

Use Browse under Select Destination Path to set your output location. Choose a drive with enough space.

Click Select Folder after you highlight the folder in the dialog.

Select a Naming Convention from the list to control how exported emails are named.

Set the Delimiter for Special Characters to Underscore, Space or Hyphen.

Hit Start Export when your destination is ready.

Click OK when the Export Process Completed Successfully message shows.

Watch the progress bar and the MBOX Scan Summary while the MHT task finishes. Export Tasks reports Source Folder, Files Processed, Failed and Speed.

Use View Result to open your converted files in Windows Explorer.

Open the MHT folder within the SysTools MBOX Converter output in Explorer.

Your converted MHT files sit in the MBOX Files folder, next to ExportReport.csv and LongFilePath.csv.

Check ExportReport.csv in Excel to compare Source Path with Destination Path, then scan the Failed Count column for problems.

Select MSG (Outlook) in the Export Options list. MSG (Outlook) creates MSG files that Microsoft Outlook opens. Click Next.

MSG (Outlook) shows the same No additional settings required for this format message. Click Next.

Click Browse next to Select Destination Path to choose where converted files are saved. Keep enough free storage in that location.

Select a folder in the dialog and click Select Folder.

Open Naming Convention to name exported email files. Choose Subject, From+To+CC or a pattern that joins Subject, From, To and Date.

Open Delimiter for Special Characters to choose the replacement for special characters in file names. Select Underscore, Space or Hyphen.

Click Start Export once the destination path is set.

Export Process Completed Successfully appears. Click OK.

Export Progress shows Items Processed, MBOX Scanned and the MBOX Scan Summary with File Path, Mail Count and Items Scanned. Under Export Tasks, check Files Processed, Failed and Speed for MSG (Outlook).

Click View Result to open the output folder.

Windows Explorer opens the SysTools MBOX Converter output folder. Open the MSG folder inside it.

Inside, you see ExportReport.csv plus a folder named MBOX Files.

Open ExportReport.csv to check where every MBOX file went and how many items converted or failed.

Select PDF in the Export Options list. PDF creates standard PDF files. Click Next.

Click Settings. PDF has five tabs, which are PDF options, Attachment, Page Layout, Font and Bates. PDF options holds two checkboxes, Create single PDF for MBOX files and Include Internet Message Header.

On the Attachment tab, open Attachment Settings and choose Attachment on Pin, Append Attachments or Save Attachment.
Attachment on Pin: Allows users to include email attachments as attachment pins within the PDF. Users can access the attached files directly from the PDF.
Append Attachment: Converts email attachments into PDF format and appends them at the end of the corresponding email content in the exported PDF.
Save Attachment: Saves email attachments separately in their original file formats without converting them into PDF.

On Page Layout, open Page Size and choose A4, A3 or Letter. Set the margins in the fields below it.

Open Page Orientation and select Portrait or Landscape.

Select Header/Footer, then type your Header text and Footer text.

On the Font tab, choose Arial, Courier, Helvetica, Times, Times-Roman or Verdana. Then set the Font Size and a color with Choose color.

The Bates tab has Bates Number and Date Stamp checkboxes. Their fields stay greyed out until you select them.

Select Bates Number to number pages in a series. Add a Bates prefix or Bates suffix, set the Start number and Number of digits and choose a Position. Bates series for file(s) continues the numbering across exported files.

Select Date Stamp to add a date, then choose its Position and Format. DD-MM-YYYY is the default format.

Return to PDF options and click Next.

Select Browse beside Select Destination Path and choose a save location with enough free space.

Choose your output folder in the Windows dialog, then click Select Folder.

Naming Convention sets your file names. Subject is the default, and other options add From, To, CC or a date.

Delimiter for Special Characters decides what replaces special characters. Choose Underscore, Space or Hyphen.

Select Start Export to begin the PDF conversion.

Click OK on the success message that confirms the export.

Track Items Processed, Time consumed and MBOX Scanned at the top. MBOX Scan Summary lists every source file with its Mail Count and Items Scanned, and the PDF task bar reaches 100% with Completed.

Select View Result to jump to the saved files.

Explorer shows your output location. Inside SysTools MBOX Converter, open PDF.

ExportReport.csv and the MBOX Files folder hold your PDF output.

ExportReport.csv lists Source Path, Destination Path, Success Count and Failed Count, so you can confirm every file converted.

Select PST (Outlook) in the Export Options list. PST (Outlook) creates PST files in the standard Outlook format. Click Next.

Click Settings to open the PST options. Select Create Single PST for all MBOX files to keep your mail in one PST file. Select Split PST to cut large output into parts, then set Split PST after and its Unit. 50 GB is the default. Click Next.

Use Browse under Select Destination Path to set your output location. Choose a drive with enough space.

Click Select Folder after you highlight the folder in the dialog. Naming Convention and Delimiter stay greyed out for PST (Outlook).

Hit Start Export when your destination is ready.

Click OK when the Export Process Completed Successfully message shows.

Watch the progress bar and the MBOX Scan Summary while the PST (Outlook) task finishes. Export Tasks reports Source Folder, Files Processed, Failed and Speed.

Use View Result to open your converted files in Windows Explorer.

Open the PST folder within the SysTools MBOX Converter output in Explorer.

Your converted PST files sit in the MBOX Files folder, next to ExportReport.csv.

Check ExportReport.csv in Excel to compare Source Path with Destination Path, then scan the Failed Count column for problems.

Select TXT in the Export Options list. TXT creates text files with inline images and separate attachments. Click Next.

Click Browse next to Select Destination Path to choose where converted files are saved. Keep enough free storage in that location.

Select a folder in the dialog and click Select Folder.

Open Naming Convention to name exported email files. Choose Subject, From+To+CC or a pattern that joins Subject, From, To and Date.

Open Delimiter for Special Characters to choose the replacement for special characters in file names. Select Underscore, Space or Hyphen.

Click Start Export once the destination path is set.

Export Process Completed Successfully appears. Click OK.

Export Progress shows Items Processed, MBOX Scanned and the MBOX Scan Summary with File Path, Mail Count and Items Scanned. Under Export Tasks, check Files Processed, Failed and Speed for TXT.

Click View Result to open the output folder.

Windows Explorer opens the SysTools MBOX Converter output folder. Open the TXT folder inside it.

Inside, you see ExportReport.csv and LongFilePath.csv plus a folder named MBOX Files.

Open ExportReport.csv to check where every MBOX file went and how many items converted or failed.

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