Method 1: Import/ Export Method
Launch the MS Outlook program on your system.
Go to the File tab.
Select the Import/Export option.
Click on Export to a file
Hit the Next button
Now select Personal file folder (.pst)
Click on the Next button.
Go to parent root and click on Include Subfolders.
Browse to define the path to the resultant file.
Method 2: Drag and Drop
Users here need to create a new PST file and then select all the OST mailbox data that they want to export to Outlook PST and drag and drop them in the newly created PST file.
Open MS Outlook program.
Create a new PST file in the Outlook.
Select all the OST mailbox data to convert them to PST file format and then copy and paste all of them in the newly created PST file.
Method 3: Use Outlook Archive Feature
After enabling the archiving feature in Microsoft Outlook, emails will get automatically saved in PST file format. To do so, follow the below steps -
Open Microsoft Outlook.
Go to the File section
Click on the Options.
Now, Go to the advanced section.
Click on Auto Archive settings…
Browse the location to define the path to save the resultant archived file.
More info: Exchange 2010 to 2016 Migration | Email Migration Service
Regards,
Bruce
Manual Steps to Change OST File Format to PST
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.
When the Export is complete, you'll get a PST file that you may use to import the mail into another account.
Once all the mailbox items are converted to PST, you can import those PST files into MS Outlook, and that is how you can Convert OST to PST in Outlook 2019 and all its earlier versions.
Greetings,
Peter
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