Here is How to Convert OST to MBOX Manually

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  • Updated on November 15th, 2019

Are you facing a problem with OST files and looking for a quick fix? Hence convert OST to MBOX is an appropriate solution. This guide will tell you all specified solutions steps wise steps. Follow us from top to end.

As we all know, OST files is an offline folder in Microsoft Outlook for the users to work offline. It allows users to synchronize changes for the next time they connect with the exchange server. But there are some limitations with OST files because of which users are migrating OST files into other formats. Let us know the reasons behind this migration process.

Why Convert OST to MBOX?

Since MBOX format is used over 30 + email client request or every item in an email account is stored like emails, contacts, calendar, notes, tasks, etc. Sometimes in MBOX clients, users may need to import the OST folder. MBOX files are compatible with many email clients such as Thunderbird, Apple Mail, Eudora, Entourage, etc. Thus, users choose to back up their emails to MBOX. Let’s get to know some of the top reasons why Outlook export to MBOX.

  • Accidentally Outlook and Exchange Server Crash
  • Maintenance exchange server shutdown
  • Exchange Outlook Email Client with another
  • Job Switching to another workplace
  • Accidentally emails deletion
  • During backup corruption in OST file 

For converting OST to MBOX, there is no direct solution first we have to convert OST to PST then PST to MBOX. Let us begin with the conversion of OST to PST.

Convert OST to PST Manually:-

Method 1: Import/Export Option

Login with Outlook with the Exchange account used to create the OST files. And, follow the simple procedure to export the OST mailboxes to PST.

  1. Visit Files tab >Open & Export and hit on  Import & Export option.
  2. Choose Export to a file; then hit on Next.
  3. Also, choose the second option—Outlook Data File (.pst)—and hit on Next.
  4. Next, choose the folder in which you want to export and hit on Next.
  5. Search the path to save the new PST file and select the options regarding the same items.

Also, you can choose another method to migrate OST to PST as shown below:

Method 2: Archiving Method to save OST emails to PST

When Archiving is enabled, outlook emails from OST files are saved to a separate PST file. Also, saving the older mailbox items in the archive folder helps in keeping the size of the mailbox at an optimum level. So, follow the simple steps:

  1. Initially, Launch the Outlook application.
  2. Go to File>Options.
  3. Then move to Advanced and hit on Auto Archive Settings.
  4. Now choose the number of days to run auto-archiving. Choose the folder to save the archived file and also, provide the archiving options.
  5. Hit on OK.

By the above steps, based on your archiving settings, mailbox items from your OST file will be saved to the PST file.

Convert PST to MBOX Manually:-

  1. Initially, download Mozilla Thunderbird on the machine.
  2. Complete the installation process of it, then open Thunderbird.
  3. Go to the File Menu > Import. 
  4. Next, import those pst files whichever you want to convert into MBOX.
  5. Then, at last, Thunderbird will convert your selected PST file to MBOX format.

As manual methods have many complications, users rarely want to run them. So, for them, there is another best option to directly convert OST to MBOX i.e OST to MBOX Converter.  This utility directly exports OST mail items into MBOX formats without any hassle. No data loss is there during the migration process. Quickly and effectively saves the data into the desired format. So, to convert OST to MBOX free, this utility is the best option to download.


Well, we have discussed all the possible manual approaches that can be used to OST to PST and then PST to MBOX. Also, we have explained a direct solution to convert OST to MBOX. It can be the best option if someone faces issues with manual approaches.

About The Author:

Adom Smith is a DataRecoveryHelp Technology Writer. He is a technology enthusiast with over 3 years of experience in Data Recovery, IoT, Artificial Intelligence, and Robotics. He enjoys researching and sharing DIY solutions as well as tips and tricks for resolving Windows technical issues.

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