Transfer MBOX File to Spark Mail – Complete Guide

  Kumar Raj
Written By Kumar Raj
Anuraag Singh
Approved By Anuraag Singh
Modified On August 5th, 2025
Reading Time 6 Minutes Reading

Mbox file and Spark Mail work on different platforms. So, importing MBOX to Spark Mail can be a difficult task. However, I am here to help you by providing two great ways.

To keep your bulk emails safe, the MBOX file is used. It is a type of file format that you can use to store your emails on your local computer. It is a widely used format that is supported by many programs, like Thunderbird, Apple Mail, etc. However, Spark mail does not support this file.

Spark mail is one of the modern email clients that you can easily use on Windows, Mac, Android, and iOS. It provides a smart inbox, collaborative tools, and smooth integrations. Therefore, many experts use this in their daily work. However, it does not support the MBOX files, which makes it difficult for you to open the file. But, I have a way that can easily move your MBOX file to Spark Mail without any issues.

What are the Reasons to Transfer MBOX Files to Spark Mail?

You understand what are MBOX file is and what Spark Mail does, but it is also important to know the reason for importing the file. Below are some of the common reasons.

  • Spark mail has a modern interface, smart inbox, and productivity-related features that make it easier for you to manage your MBOX files.
  • If you have multiple MBOX files and use Spark Mail. It is better to move the data to one account for better management.
  • Spark mail can be accessed on multiple devices. Therefore, by importing the file, you can also access your data across different devices.
  • You can easily share your MBOX file in Spark Mail. Because of its collaborative features.
  • For backup purposes, some users want to move the MBOX file. So that the data will be saved.

Here are the common reasons why many users want to move their data. So, without wasting let’s see how you can upload your files in Spark Mail.

Import MBOX to Spark Mail by Thunderbird

Thunderbird is one of the email applications that can support MBOX files and an IMAP server. So, with the help of this, you can easily move your files. To understand the process, I am going to divide the process into two parts.

  1. First of all, open Thunderbird and click on the three bars in the top right corner.
  2. Click on the Account Settings from the drop-down list.
  3. Select the Account Action option and then press the Add Mail Account button.
  4. Provide the Spark Mail account details, including email address, password, and username. Hit the continue button.
  5. Choose the IMAP option, and Thunderbird will automatically identify your settings. If your details do not show, you can add them manually.
  6. Continue the process and connect your account.

If you provide the correct details, then Spark Mail will automatically be configured, and you can now upload the MBOX file.

Open MBOX File and Move to Spark Mail

After connecting your Spark Mail account with Thunderbird. You can now easily open the MBOX file by installing Import/Export Tools NG. Follow the steps below.

  1. In Thunderbird, select a folder where you open your files.
  2. Right-click the folder and choose the Import/Export Tools NG option.
  3. Select the import MBOX file from the drop-down list.
  4. You can either choose to import individual MBOX files or import the directories.
  5. Browse the location where your MBOX file is located and open it.
  6. Once your file is imported into Thunderbird, go to the folder where the data is.
  7. Select an email and move it to the Spark Mail folder. This way, your data will automatically sync.

This is the proper way to import MBOX to Spark Mail. The method may seem long, but it will work. However, before going through the process, you must also consider your emails in Spark Mail, because there is a chance of losing your current data when you are syncing and importing your MBOX file.

Professional Way to Store Spark Mail Emails

To secure your Spark Mail data before going through the process. Use SysTools IMAP Backup Software, a professional tool that can easily save any IMAP-related account. Because Spark Mail uses the IMAP server. This software would be a great option. Users can easily use it on their Mac operating system. And also save the data in multiple formats to make it easier for you to access your file.

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Why Need to Backup Spark Mail?

Before the migration process, backing up your data is a must. Because of several scenarios like

  • If your Spark Mail account’s mailbox is nearly full, in that case you have to move the existing data to a secure space. So that you can free up some space for importing new files.
  • Some users want to start with a new, clean inbox, but if later they need to access their older Spark Mail data. In that case, you have to back up your mailbox.
  • If your organization follows email compliance or legal retention. Then, you must save your existing emails before importing other data.
  • If the folders for importing the MBOX file and your inbox have the same name. There is a chance of syncing, overwriting, or merging folders automatically. So, back up the data to avoid any of these issues.
  • By saving your Spark Mail also provide yourself with full control over your data.

That’s why many experts advise you to first save a copy of your important Spark Mail emails.

Concluding Words

If you want to know how to import MBOX to Spark Mail, this article provides you step-by-step process. Here, I have explained the reasons for moving your files. Then, provide the ways to easily transfer your MBOX files. In addition, I also provide you with a solution that will be helpful in your process.

  Kumar Raj

By Kumar Raj

He is an ardent tech enthusiast and has a specialization in simplifying complex tech topics. With a knack for staying ahead of the curve, he provides readers with up-to-date insights into the ever-evolving tech world. When he is not writing, he enjoys exploring new gadgets and is actively engaged in tech communities.