OST to Thunderbird Converter
Convert OST to Thunderbird (Mails), Contacts (*vcf file), Calendars (*.ics file).
Works on both Windows and Mac Systems
OST Extractor Pro (Windows and Mac) helps you to convert OST to Mozilla Thunderbird, Apple Mail, Postbox, PST, MBOX and EML file formats. Easily transfer or recover your emails from Microsoft Outlook OST data file including Mails, Calendars, Contacts and other file formats.
Easy to use program
Accurate data conversion
Bug and Error free conversion
Fast and convert any size of file
OST to Thunderbird Converter for Mac and Windows
Reasons Why Experienced IT Users are Talking Favorably about This OST to Thunderbird Converter!
Change is difficult. Out of all sorts of frustrating situations, the phase when there is a change either intentionally or not, can be the most frustrating of them all. From moving houses to changing services to switching clients and to moving data across email clients – all of them involves extensive work and careful planning, so as to not to lose productivity, data/stuff/items, and at the same, be sane while doing it and get exhausted.
Not a surprise that when it comes to converting OST to Thunderbird, most users feel a sense of dread that erupts from inefficient third-party tools, sloppy interfaces, slow data-conversion rate, lack of support, and so forth.
However, most smart users tend to avoid unknown software applications, manual techniques that are not the most productive, or anything that doesn’t have professional support. Sadly, OST to Thunderbird converters are the least efficient tools one can find on the web, mainly due to the varying nature of both data formats and the challenge involved in extracting complex data items.
All of this can make a conscious and careful user frustrated.

Today, we bring to you a simple and yet powerful approach to move data from OST to Thunderbird that is free of such incongruities and challenges. This is the way of USL Software.
USL Software came up with “OST Extractor Pro”, which changes the inner dynamics of data processing, resulting in a far better solution for an otherwise frantic process. If you care about your time/productivity, data integrity, and essentially just likes to take the professional and efficient approach for everything, you will find it to be akin to your likings.
So, what makes “OST Extractor Pro” so well-endowed and recommended by the experts worldwide?
OST to Thunderbird Converter, that gives you accurate results
Before we talk in detail about this OST to Thunderbird converter and all of its enhanced features, here’s a briefing about the background nature of the task and what it is all about:
Smooth OST to Thunderbird Conversion
OST is a file format from Outlook that stores data from the servers of your email account. The email file is not meant for manual data operations like back up or migration. Its primary task is to let the users access data even in an offline mode. Outlook pretty much does all of this in the background and automatically. But certain cases leave users with isolated and inaccessible OST files. They are not importable back into Outlook or any other email client.
This is when converting the file to another format is required. For users moving away from Windows Outlook to Thunderbird and have only OST files with them for Thunderbird. Then, the only way forward is to use a third-party tool for converting emails inside OST into files that Thunderbird can understand and read.


No Data Corruption
Since processing emails and extracting them to a separate format is incredibly sophisticated, most generic converters fail. They either have no necessary feature to make the job doable or efficient. They are too limited with the algorithms and can end up with data fragmentation and gaps.
“OST Extractor Pro” is developed extensively using advanced algorithms and dedicated logic. That enables clean extraction for all kinds of information stores inside OST. It implements the multi-phase and multilayered algorithms to process files extensively and rigorously. So there is no result in any partially conversion of data or corruption.
Accuracy of Data Conversion
To expand on this a bit further, email files are made up of many complex interwoven items like images, attachments, headers, metadata, folders, email addresses, and much more. A typical and ordinary OST to Thunderbird converter would fail to convert all of them with required level of precision. You would find many errors and dissimilarities with input and output, also called data integrity loss. Only ‘OST Extractor Pro” has what it takes to get from point A to Point B. Which in this case is, from OST to Thunderbird, without the cost of fidelity.


Support Unicode Contents
Two more central pieces of information in OST files are the hierarchy of your folders and non-English text. Both of these items are tricky to retain during data conversion, but ‘OST Extractor Pro’ handles them with professional standard of precision and care. You would find all Unicode text, Chinese or Japanese characters, MIME defined content, and the structure of your folders exactly as they were in original files.
Simple and Powerful
Next up, the fact that this tool is recommended by experts for your large-scale migration projects and also to basic users for relatively smaller conversion tasks makes two very important points. Firstly, it has no shortage of advanced features required to make up for the problems usually associated with large scale projects. But also through its simple interface that anyone cause. The tool comes in handy for basic home users to convert their folders in OST files to Thunderbird. Most OST to Thunderbird converters are either too simple to offer any kind of benefit or are too complex that even experts find themselves struggling.


Other than that, it also has the following features:
- Allows users to manually remove folders that they don’t want to convert.
- It also converts OST to other formats like PST, Apple Mail, Entourage, and EML files.
- The data conversion rate is too fast to allow for quick conversion without wasting too much time. Even massive data in OST files can convert extremely fast.
- It allows for batch conversion, meaning you can select multiple OST files. It can convert them to Thunderbird (or other formats) in one go.
- The detailed and brief conversion log helps you analyze the results much more efficient, especially helpful for advanced users
- It supports OST files from all Outlook versions, including Exchange ActiveSync and Office 365.
24×7 Expert Support
Finally, “OST Extractor Pro” is the only OST to Thunderbird converter that backs up by 24×7 tech support built of email migration experts. The support staff is friendly and would respond to your quarries or problems promptly. They will help you solve anything that you think you may need help for.

Get it to Convert OST to Thunderbird (Mails, Contacts and Calendars)
Download the trial setup to check it out all of its features now and get a taste of how it works in action. There’s nothing to lose. You can activate it later using one of the several licenses.
“OST extractor Pro” is also available in both windows and Mac version; you can download the one that suits you best and depending on which ever platform you work on. For OST to Thunderbird conversion, it would be convenient to go with the Mac OS version, but if you are a Windows user, you can choose the windows’ one.