How to migrate MBOX to Office 365?

Migrating emails from one email client to another or Office 365 is a complex task that requires a lot of time and investment. In the case of Thunderbird, there are no direct methods to migrate MBOX files (used by Thunderbird) to Office365. However, you could migrate Thunderbird MBOX to Office 365 in a two-step procedure. For this, you require to move MBOX emails to Outlook and then import them to Office 365. But this manual method is effective only when you require exporting a limited number of emails from MBOX to Office365. Here is how you can succeed in migrating MBOX data from Thunderbird to Office 365.

  1. In Mozilla Thunderbird, open the folder containing the required emails.
  2. Select the required messages, and then select Save As option from context menu.
  3. Browse the destination folder on the system, and save.
  4. Now open MS Outlook, and create a new folder.
  5. Drag the emails from the system folder to the new Outlook folder.

If needed, you can preview the emails in Outlook. The next step is to upload the Outlook PST files to Office 365 with the help of "Office 365 Import Service". You will need to use a tool named 'Microsoft Azure AZCopy Tool' that will help to upload the PST. The steps are given below in brief:

  1. Share your PST folder over the network.
  2. Install the “Microsoft Azure Storage Tools” (you can download it from the site).
  3. Launch the tool, and get the unique network URL and key for uploading.
  4. Use azcopy.exe to upload the PST files.
  5. Use the Microsoft recommended format to create a mapping file.
  6. Finally, import the PST fil data into Office 365

The manual method is fair enough to export MBOX items to Office 365 but with some significant limitations. Migrating emails is a tedious task for users without any technical background. Another major drawback is that there is no guarantee that it will conduct complete and accurate MBOX to PST or PST to Office 365migration. There is a chance that you might miss some mail or document during the process. Plus, the manual method is not effective for multiple file migration as the process is time-taking and risky.

There is a way by which migration from Thunderbird MBOX to Office 365 file can be performed quite efficaciously. This is by using a third-party migration tool like Kernel MBOX to Office 365 Migrator. The migration can be smoothly accomplished in just three steps. The steps involved are explained below:

  1. Browse for the folder containing MBOX files or add the MBOX files.
  2. In this step, you can preview the mailbox data. After the preview, select the option ‘Office 365’ to save the data.
  3. Provide the Office 365 credentials and save the MBOX data.

The tool has been designed to overcome all the impediments faced during the Thunderbird MBOX to Office 365 migration. This tool is free from any technical glitches and instantly exports MBOX files to Office 365.


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