To transfer the Outlook OST file to the PST file we generally use the manual method to convert the OST file and that's the biggest mistake that we make to convert OST files you need to use a professional method to convert OST file you need to use a professional tool like Data Recovery Freeware OST to PST converter or Aryson OST to PST converter. These two tools come with so many features this tool converts the OST file into multiple file formats like PST, PDF, DOC, HTML, etc. However, this tool transfers the OST file to a number of email clients like Office 365, Thunderbird, Yahoo, etc. However, this tool maintains the data hierarchy throughout the conversion process and is compatible with all the other versions of Outlook, and MS Outlook.

Professional Steps to convert OST file

- Download and install the OST to PST converter in your system. 

- Then select the OST file to select and click on the next button. 

- Then select the file format to convert and set the path to save button.

- Lastly, click on the convert button to start the conversion process

There are some other methods to convert OST files if you want to know the other methods to convert OST files then read this article 3 easy methods to convert OST to PST.