MS Outlook OST files are linked to certain systems and settings since they are copies of Exconvert servers that are stored on the user's computer. You require MBOX files when you switch to open-source platforms like Mozilla Thunderbird and SeaMonkey, though. So, convert OST to MBOX, however this backup that works on several platforms often breaks formatting, loses directories, and corrupts attachments. So, this blog is a good place to find freeways and an

Most of the time, when a conversion fails, it's because the OST files have MIME headers and indexed flags that aren't handled correctly. OST is built on a proprietary format, while MBOX files store communications as plain text. It has rich characteristics, metadata, sync states, and cache flags. When people export OST to MBOX, the usual ways they do it typically overlook the following:

  • Items on the calendar, notes, and journal entries
  • OST files with nested chats that can happen in many threads
  • Attachments and media that aren't text are included with the emails.

You might plan to convert OST files to PST first and then import them to MBOX for the best results. Why? This is especially useful for manual conversions when you have Outlook installed and wish to keep the native compatibility. But the professional expert-recommended utility is the best of all.

How to Manually Convert OST to MBOX

We will utilize Mozilla Thunderbird as a middleman because there is no direct way to convert for free. But first, you should know that this process might not include contacts, calendars, or attachments, depending on what Thunderbird can do. 

To keep Going, Follow These Steps to Convert An Outlook OST file into an MBOX file:

  • To open the .ost file, use the MS Outlook profile that is linked to a Cached Exconvert Server.
  • Then go to File, then Open & Export, and then Import/Export.
  • Select Export to File from the list of options and then press Next.
  • Also, choose the Outlook Data File format (.pst) and then click Next.    
  • Pick your OST and continue the process to move it to PST.
  • After that, make sure Outlook is still the default email application and then launch Thunderbird.
  • Now, click More (≡), then Tools, and finally Import. A dialog box will open.
  • Click on "Import from Outlook," and then choose the PST file data in the next step.
  • Press Continue, review the data, and then click Import →Finish to store the OST files.
  • Lastly, use the ImportExportTools NG add-on to export MBOX from Thunderbird. 

There is Another Free Technique To Convert OST to MBOX besides this one.

There are three steps to it:

  • Changing OST to PST
  • Using the Tool to Import PST to Google Workspace
  • And last but not least, using Google Takeout to export OST data as MBOX

Other Problems with the Manual Methods

  • It can take too long, there is no data security, and it can be a real pain.
  • It's hard for people who aren't tech-savvy to do all the steps, and mistakes can happen.
  • You can't convert orphan OST files, and some of the data is also relocated. It isn't very trustworthy, though.

Standard Way to Convert an OST File to an MBOX

The Softaken OST to MBOX Converter Tool is better for businesses and user who need 100% data integrity, a folder hierarchy, and the ability to work with huge OST. It keeps metadata, MIME structure, and attachments for all versions of Outlook and Exconvert OST. You don't need to install Outlook to use it, and you may try out its demo version first to see how it works. 

Follow the steps below to convert OST to MBOX:

  • Start the OST File to MBOX Converter and choose a radio option.
  • Click Next. To make convert add the Outlook data file (.ost). Again, click Next.
  • Also, look at the emails, attachments, metadata, and some folders ahead of time.
  • Hit Next. Choose the (.mbox) option from the drop-down menu.
  • After that, use the right filters and give a Path to Save right away.

Finally, click Convert, and all of your OST files will be convertd to MBOX right away.

In conclusion

If you need to convert OST to MBOX without losing any data, keeping the structure, and making sure it works on all systems. The manual method might work for now, but you'll have to find another way eventually. Instead, use the professional tool above to convert your files without any problems right away. If you need help with anything or want to speed up your huge mailbox archive exports, feel free to ask our IT specialist at any time.