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If you want to convert OST to PST format, then try manual solutions. Using manual methods, you can save money. There are various methods available. You can choose any solution at your convenience. I want to suggest a nice post about this topic. I am going to mention the link below. Hope this will help you.

https://www.syscurve.com/blog/how-to-convert-ost-to-pst.html

If you are exploring how to migrate OST to Outlook, then, utilizing the best software, whose name is the Softaken OST to PST converter software, it can simply convert OST emails into Outlook files without damaging any data in OST. Through the conversion of the format, styles, email headers, and elements, the conversion is secure. It can also provide a free demo for users, through which users can export the initial few details of OST email into Outlook. Refer:- https://www.softakensoftware.com/ost-to-pst-converter.html

A professional OST to PST Converter can risk-free convert single or multiple OST files into PST with email attachments and other mailbox items. It also can bulk convert and migrate OST files into 20+ file formats and email clients on Mac with ease. Users can exclude duplicate emails and eliminate the mail attachments from the conversion process. OST to PST Converter Tool provides a Mail Filter option through which users can convert and migrate selected emails only. It also provides an option to name the resultant file and set the custom location prior to the conversion process.

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.
When the Export is complete, you'll get a PST file that you may use to import the mail into another account.