The eSoftTools OST to PST converter tool converts various OST files to Outlook PST formats and restores lost and unavailable OST data items like addresses, contacts, tasks, calendars, journals, and other products. OST data can also be exported to Office 365, Live Exchange Server, EML, MSG, and HTML formats. Users can first download the tool's beta version and validate it, as well as convert the first 25 data files.
Read more:- Convert OST to PST files

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Convert OST to PST Manually
Open Outlook and go to the File menu.
Select the Import/Export option.
Choose Export to a file.
Select Outlook Data File (.pst)
Choose whether to export a specific folder or the whole account.
Check the Include subfolders box.
Next, select a destination for the Export, and then click Finish.
This may help, J Wick
Make your OST file error-free with PassFixer OST to PST Converter tool. It easily fixes your all OST file data and gives you good results. And also you can convert your OST file data to PST and various formats such as HTML, vCard, Yahoo, MBOX, EML, MSG, Gmail, Office 365, Zimbra, and ICS. you can also check the preview of your OST file before conversion check with the live preview feature. Try the free demo version of this tool from the official website of PassFixer.
Read more- Free OST to PST Converter
Follow the Steps to Change OST to PST in MS Outlook
Download Aryson OST to PST Converter Software from the official website.
Launch the tool and Browse the OST file which you want to convert.
Choose the Scanning mode, either Standard or Advanced.
After completing the scanning process, you can view all the files and folders of the OST file.
Select the files and folders which you want to change to PST.
Click on the Save Button.
Define the Path for saving the PST file into the system.
Once the saving process completes, you'll get a confirmation message.