Now converting OST to PSTis easier. An easy to use migration tool which help you in converting your mail database from OST file format to PST. One can use free trial version for experiencing the migration using this converter Tool. It is a window OS compatible tool and fully run on Window OS.
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.