What is OST to Office 365 converter? And how you can easily convert OST file to Office 365 supported PST file format.
OST to Office 365 Conversion
Office 365 is a subscription model for Office apps like Word, Excel, and Outlook, from Microsoft, available for both Mac and Windows. The one that we are concerned about here is Outlook, an email client that comes as a part of Office 365 suite. It allows you to manage your emailing needs productively, through powerful features and a functional interface.
The Challenges
The problem, however, is that one of the data files called OST is not suited for manually importing to the client. The reason is that it is not needed in most cases.
Office 365 or Outlook 365 email client works for the most part automatically with your email servers and OST file. Whenever you add an email account that is IMAP, Exchange, or Outlook.com account to your Outlook, it downloads the data from the servers into an OST file. The file is stored in your local system and is all the time synchronized with the email account online. This lets you access emails even without internet connection.
But due to several factors, this file can be isolated and become inaccessible, leaving you with no choice but to convert to PST.
PST is the manual or personal data file, used with POP accounts. But you can use it personally for data import, export, or backup.
OST to Office 365 Converter Tool
Therefore, if you have the inaccessible or isolated OST file, you can simply convert it to PST. And we recommend doing it with the help of “OST Extractor Pro”. It is the most viable option for basic home users and beginners to get the data restored easily, while not facing any integrity hiccups or losses.

“OST Extractor Pro” brings many powerful features to the table that were previously only available for large companies through custom-built heavy tools. This one is simple to use while also offering those functions that deliver a streamlined experience to everyone.

Important to check while converting OST to Office 365
For instance, here are some of its glaring features that you will love:
- It can convert the more complex types of information inside these files, such as attachments, headers in MIME format, text in Unicode format, email addresses, graphical components inside the bodies of emails, and so on.
- The tool also brings the multilayered and precise logic to preserve your folder hierarchy or structure. It can map all the folders from OST to PST without misplacing or disrupting their order.
- The simple and graphical based UI simplifies the job. All you need to do is load the file you want to convert and click ‘Convert’ after choosing the output format as PST.
- There is a manual option to remove or ignore any folder inside OST file that you do not need to convert to PST. Another option is to ignore all empty folders at once in a single click.
Very few OST to Office 365 PST converter works with this level of efficiency without overwhelming the users. “OST Extractor Pro” brilliantly mixes the advanced functionality with its friendly interface, making it possible for the first time to convert files without any issues.

How to Convert OST to Office 365
- Get ‘OST Extractor Pro‘.
- Install it on Mac or Windows.
- Launch it and click on “Add OST“.
- Browse PST file and click on ‘Open‘.
- [Optional] Check ‘Ignore Empty Folders‘.
- [Optional] Check/uncheck folders to convert.
- Select output format – PST File (*.pst)
- Click on “Convert‘.
- Select a folder to save output file and click on “Save“.
Get this OST to Office 365 Converter
Download a free trial setup below. This will let you try it out in more detail to evaluate the full performance from up close.
Get it here: https://www.ostextractorpro.com/

As this tool comes from USL Software, you obviously get the usual benefits that the company offers with every tool, such as tech support and free updates for lifetime.
OST Extractor Pro is the only OST to Office 365 converter that works on both Windows and Mac system,