The eSoftTools OST to PST Converter tool converts Exchange OST messages, contacts, schedules, tasks, notes, and attachments into PST, Office 365, EML, MSG, HTML, EMLX, MBOX, etc. You can use the email filter option to separate emails by date and save all information from an OST file with email items to a PST file, with the option of splitting the PST file by size up to 5GB. All Exchange OST File adaptations up to 2016 are supported by eSoftTools OST to PST Software.
Get Know More:- Recover OST files
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.