There are various free tools which do the work for you and are quite reliable in converting your OST files into PST formats.
So before going for any paid software, I would suggest you to go for a free software.
One free tool that I have used earlier was Aryson OST to PST converter.
You may just google it...

Hope this answer helps
If you are not much into coding and implementing things technically, you should not try manual tips to Convert your OST files into PST file format. There is a best tool I can suggest is Repair OST files, by which you can easily convert your OST files into PST format without affecting the original content.
I’m just sharing our experience about EmailDoctor OST to PST Converter software,

Consequently, the most well-known way is taking the support of any professional Software, but, selecting the superb software is a very hard-hitting job for users. There lots of software’s are obtainable in the market that claims to Export offline OST data to PST outlook file format, but in representatives, several tools fail to repair OST File. So, you need to choose the correct tool to recover damaged OST file and it is effortlessly migrated OST mailbox into Outlook with multiple formats.

Get More info: http://www.emaildoctor.org/convert/ost-pst.html
Two known methods of migration are available, first is manual and second is using ost to pst converter software. The manual method is a lengthy, time-consuming and risky process as any wrong step will result in lost or corrupt data. I prefer professional conversion software to retrieve data. It is a result-oriented, safe and effortless process. Choose ost to pst converter software by comparison and marking the review.
Get OST Recovery utility tool to Fix /repair and Convert OST emails into Outlook PST file format . This OST Recovery tool easily fix errors from a OST file and immediately save OST into Outlook PST format to open /read and access the OST file emails . Software greatly Support all version of OST upto 2016 For more details please visit http://www.ostfileexporter.com
Download best atom techsoft ost to pst converter software to access corrupted ost file into ms outlook .This software give full authority to access ost into outlook with all internal folders like as inbox ,calendar ,notes ,contacts ,task ,etc .Software easily works on all version of ms outlook ost file such as ost 2016,ost 203,ost 2010 ,ost 2007,ost 2003,ost 2000 ,etc .

For software contact expert and get free software for download :- support@atomtechsoft.com

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OST to PST Converter software is a reliable and efficient software to convert offline storage OST file to equivalent personal storage PST file. you can smoothly recover unreadable Outlook OST file and convert OST into PST file format with all Outlook OST file emails Meta data like: cc, bcc, to, from, date, time and subject etc. Software has user friendly nature and allow all Outlook OST users to extract OST data into PST.
use automated tool to convert ost into pst, if you are not too much in coding the manual process could be nightmare for you.
Taking the help of OST to PST converter program users can convert single as well as multiple files in a few little moments with full ease. Before the conversion task users can view the preview of recovered mailbox then store the data into Outlook PST file format. It baking OS Windows’s version like 95, NT, 98, ME, XP, Vista, 7, 8, 8.1 and 10 (32 bit & 64bit). The software support cloud-based application Office365 & Live Exchange Server.


Read More Info: https://www.inquitsoftware.com/en/ost-to-pst-converter.html
If you want to convert OST files into PST. This tool is easy so you should try this 100% safe and most trustable Softaken OST to PST Converter tool. Converts OST files to PST, EML, MSG, and HTML file format. This application exports single or multiple OST mailboxes into PST file format at a time.
SysOZ OST to PST Converter that removes all problems which are related to data conversion and data recovery. The users can simply export their data of OST file into PST file format along with emails, notes, contact, attachment, task, draft, journals, and inbox (To, Cc, From, Date, Time, Subject, Object, and Bcc). You can also convert your data into various different formats such as PST, EML, EMLX, MSG, vCal, vCard, MBOX, etc.

Read More: SysOZ OST to PST Converter

You can also use it as a great option for regaining and migrate OST files to PST files. By using this best and advance designed this Turstvare OST Converter software, It can securely extract all database items from a corrupt OST file and export them to a fresh readable PST file.

It saves converted email into PST, MHTML, HTML, EML, MSG, PDF, EMLX, IMAP, TGZ and MBOX.
Successfully extracts contacts, emails, calendar, notes, journal, tasks and other items.
Able to work with offline OST file and convert it to PST format.
It is competent in working with malware, ransomware victim OST file as well as corrupt OST files.
The best method for converting OST to PST is to use the vMail OST to PST Conversion Tool. Using the utility is reliable, safe, and secure. Even novice users can view OST thanks to this program's ability to convert it into a range of various file formats and email applications. The application can quickly move Outlook OST data without modifying the original data in any way. Users can place their exported data in the proper location on the desktop. Both expert and non-technical people can convert OST files to PST format with this tool. Additionally, it offers its customers a free trial version and a team of support professionals who are on call 24/7.

Know more info- OST to PST Converter for Mac | Outlook OST Recovery
The OST to PST Converter Tool is a powerful and reliable software solution designed to convert OST files to PST file format with ease. It supports the conversion of large-sized OST files and offers various advanced features such as selective file conversion, the ability to split large PST files, and the option to remove duplicate items during the conversion process. The tool also offers an intuitive user interface and ensures data integrity and accuracy throughout the conversion process.
Try this vMail OST to PST Converter program to export OST to PST and 10+ other formats such as HTML, Gmail, Office365, Zimbra, vCard, ICS, CSV, EML, EMLX, Yahoo, and so on. This software can filter emails. It never loses your information during the conversion and gives you a perfect, correct result with no data loss. It provides trial versions to ensure your satisfaction. In this program, you receive vast converting features, and those features make the software advanced with clear and simple methods. It can offer technical support 24 hours a day, seven days a week.

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