Summary: The tutorial summarizes the manual procedure to convert Thunderbird MBOX filesintoMS OutlookPST orOffice 365. It also discusses the limitations associated with manual conversion approach and suggests a direct method to perform MBOX to PST/Office 365 conversion by using a specialized MBOX to PST converter tool
Mozilla Thunderbird is a freeware email client that stores mailbox data in an MBOX file. There may arise a situation when you need to access Thunderbird data in Microsoft Outlook and Office 365 email clients. However, both these email clients does not support MBOX file. Thus, to move mailbox data from Thunderbird to Outlook or Thunderbird to Office 365, you will need to convert MBOX to PST.
Personal Storage Table (PST) file is an Outlook data file that can be easily imported into Outlook or Office 365 account.
Check out major reasons to move from Thunderbird to MS Outlook/Office 365 in below infographic:
Manually Convert MBOX File into MS Outlook PST or Office 365
The manual procedure to convert Thunderbird MBOX email items to Outlook PST can be categorized into three steps:
Important! The following steps apply to Outlook 2007 or earlier versions. If you have set up a POP account in Outlook 2010 or later versions, you can directly export EML files to aPST file format. To do so, perform the following:
In MS Outlook, Open the folder that stores EML files.Next, Select all the EML files and then drag and drop them into an outlook PST folder
You can also create a new folder in PST mailbox to store all the converted EML files. But, keep in mind, you cannot directly export EML file to PST format when Outlook uses an IMAP email account.
Convert MBOX files to EML
Transfer EML to Windows Live Mail
Export emails from Windows Live Mail to Outlook PST
Now let’s discuss the manual Thunderbird to PST conversion process in detail.
Step 1: Convert MBOX Files to EML
The first step requires converting Thunderbird MBOX emails to EML file format, as EML file can be opened in Outlook. To do so, follow these steps:
Launch Mozilla Thunderbird app, and open the folder you want be exported.
Select an individual email or click Ctrl+A keys to select multiple emails.
Right-click the selected emails, and then click Save As to store all the messages in EML format.
In Save As Message dialog box that appears, choose the folder where you want to save the converted files, and then click Save.
All the selected MBOX emails will get saved with .eml extension at the desired location.
Once the MBOX files are converted to EML format, the next step is to convert the EML files to any of the email programs – Outlook Express, Windows Mail or Windows Live Mail. Here, we will discuss the procedure to convert EML emails to Windows Live Mail.
Detailed steps are as follows:
Launch Windows Live Mail, and select an existing folder or create a folder.
In Windows Explorer, open the folder that stores all the EML files.
Select all or specific EML files that you need to convert to PST file format from Windows Explorer.
Next, drag and drop the selected EML files to the mail folder in the Windows Live Mail.
Now, repeat the drag and drop procedure for every individual folder that needs to be converted.
Note: Manually moving large number of emails from Thunderbird MBOX file to Outlook may cause the email applications to freeze or crash. This may further lead to file corruption or data loss. Use a professional Thunderbird to Outlook converter tool to move bulk messages to PST format without data loss risk.
Step 3: Export Emails from Windows Live Mail to Outlook PST
Now, when all the email messages are imported to Windows Live Mail, export them to Outlook
Note: Before performing this step, make sure that the MS Outlook is installed on the computer. Also, you need to know that any image files embedded within the Windows Live Mail messages will be converted as attachments that might appear empty when you attempt to access them.
You may successfully convert Thunderbird MBOX to PST files by following the above stated manual procedure. However, the manual conversion process involves the following challenges:
It is a complicated and time-consuming process.
It does not ensure data integrity, as the original folder structure of MBOX file may change.
Converting EML files to Windows Live Mail manually requires repeating the same conversion procedure several times for every individual folder.
Attachments are displayed as empty after the conversion is completed.
Direct Method to Convert MBOX Files to Outlook PST File Format
Stellar Converter for MBOX is purpose-built to helps users convert Thunderbird MBOX file to PST format in a few simple clicks. Also, the technical edition of the software allows to directly export resultant PST file to Office 365.
Allows batch conversion of multiple email files from Thunderbird to Outlook mailbox.
Converts all the MBOX file components to PST file in their original, intact state.
Allows exporting all messages along with attachments.
Supports multiple file saving formats like RTF, HTML and PDF.
Besides Thunderbird, the software allows conversion of mailboxes from Eudora, Opera, Entourage, AppleMail, Spicebird, Pocomail and other email clients to PST.
Though you can manually convert Thunderbird MBOX file into MS Outlook PST or Office 365 format, maintaining data integrity can be a challenge. Essentially, the manual Mozilla Thunderbird export to PST process can help you export email items, but the original folder structure of Thunderbird mailbox may be different. Also, the manual process doesn’t support converting other mailbox items such as contacts, calendar, notes, etc.
Use a specialized MBOX to PST converter utility such as Stellar Convert for MBOX to convert Thunderbird mailbox to PST, preserving the original folder structure. The utility also helps export all the mailbox items from Thunderbird email client to Outlook. Also, by using the technician version of the software allow to directly export thunderbird to Office 365.
Eric Simson is an Email Platform Consultant and is associated with Stellar Data Recovery from last 6 years. He writes about the latest technology tips and provides custom solutions related to MS Outlook, MS Exchange Server, Office 365, and many other Email Clients & Servers.