Open OST in Postbox…. here is what you need to do.
Open OST in Postbox for Mac/Win
OST format is used for storing emails by MS Outlook Windows. But it cannot be used for any manual tasks, like data archiving or migration. It is meant to be used for offline access of your mails, while the changes are synced to the servers online. This is the primary cause of confusion by many users, who mistakenly keep the OST files as backup.
In short, you cannot import or open OST in Postbox or any other email client.
But do not worry. The emails in OST files are not lost forever. There is a way you can still recover them.
Best Way to Open OST in Postbox
To open OST in Postbox, you need to first convert the file to Postbox compatible files. This can be done quickly by ‘OST Extractor Pro‘, one of the best apps for all OST conversion tasks. It can also convert OST to PST, Apple Mail, Thunderbird, MBOX, and EML files.

There are other OST converters too that can help you to import OST data in Postbox through file conversion, but there is a reason we recommend ‘OST Extractor Pro’. In fact, there are multiple reasons: quick conversion, easy interface, technical support, data accuracy and safety, and more.
Many of the OST to Postbox conversion tools do not have the necessary internal logic that can keep your data intact in the original structure. What happens often is that a basic tool would modify or even lose certain details from your files during conversion. This is called data integrity loss, where an actual email is converted but a lot of details are not, or the structure is messed up completely.
Accurate Conversion
‘OST Extractor Pro’ works differently. Through the meticulously built algorithms, it is able to convert with precision unlike any other. You will never find anything misplaced, partially converted, or modified structure. From the tiniest element to the largest component of the OST files, the app works consistently throughout offering the most accurate outcome possible in email migration.
Convert Any Types Data Inside OST file
This was made possible by writing dedicated scripts for the most complicated elements, rather than a single batch of generic scripts that other tools rely on. This is a radical improvement on how email migration tools and OST converters specifically works for extracting the information. The users get fully reliable system for all their complex emails, including the headers Unicode text, text formatting, etc.
And lastly, the tool works on its own. The fully standalone software for opening OST files in Postbox works reliably without requiring any other utilities, add-ons, or anything. It is also completely offline and desktop-based, requiring no internet connection to work.
Available for both Mac and Windows
It is also the only OST converter that is available for both Windows and Mac users. And there is a free trial version you can download to check it out.
It is worth noting that the technical support of USL Software can often be the overlooked aspect, but in some cases, it can make a huge difference, especially in work-related OST to Postbox migration projects. Get in touch if you face any problem or have any questions.

How to Open OST in Postbox
- Get ‘OST Extractor Pro’ for Mac or Windows.
- Install it on respective system.
- Launch and click on “Add OST”.
- Browse and locate the OST file, then click on “OPEN”.
- Check optional settings.
- Now choose output format as “Postbox, *.ics, *.vcf”.
- Then click on “Convert”.
Get it to Open OST in Postbox
If you want to open OST files in Postbox, it is not possible literally, but ‘OST Extractor Pro’ is the only tool that works without issues for converting it into the appropriate format.