Microsoft Outlook is one of the most popular email clients, and this tool is used by millions of users. And this is some of the rules and limitations of the application, according to the version of Outlook such as File Size Limitation, Exchange OST File Do not replace original account, etc.
What is OST File & PST Fie?
When users use Microsoft Outlook and users configures an email client to choose three Method option as Microsoft Exchange Server or Compatible Service, or Exchange ActiveSync Compatible Service and Pop or IMAP Options. When users choose IMAP or POP option to Create PST File and other two options to create.OST files.

OST file is just connected to an Exchange Server account type to Access emails, Contacts, calendars, task and Voice Mails, etc. OST (Offline Storage Table) file is a very sensitive type of file to replace, virus attack, system failure, and Server Shutdown, etc to files is breakdown (breakdown means the file is damaged, corrupted or unreadable, etc.) Create two types of Outlook files. And Second Crate PST file. PST file is Personal Storage table to store emails, contact, calendars, etc. and more one thinks this file is moved one system to another system.

Why Convert OST file into PST file.
When OST file is corrupted then users need to OST file data and this OST file is not accessed into Outlook then users one option to export or Convert OST file to another file like PST, EML, MSG, EMLX and MBOX, etc types to use user data to another email client. If you want to use OST file into Outlook to only one option Convert OST to PST file.
How to Convert OST file to PST File.
There are an available free and paid method to Convert Exchange OST file to PST file. Explain this free and paid method…
How to work free manual method: 

There are available two types of free Method such as Import & Export Methods and freeware tool scanpst.exe or Scanost.exe methods.

Import & Export Methods: Import Export method only work at when OST file is connected Outlook. Follow some steps to Export OST file to PST file format.
•    Open MS-Outlook and click to the file tab.
•    In the file tab menu to select OPEN & Export.
•    After Select OPEN & Expert then you choose Import & Export option.
•    After Select, Import & Export then Select Export to a file Option then Click NEXT.
•    Create a NEW file option to Select Outlook Data a File (.PST) then click NEXT.
•    Select To Mailbox to Export in PST Format then Click NEXT and allocate Save PST Location.
•    Click to finish. Process Complete.

Use Microsoft Outlook Provide freeware tool scanost.exe or scanpst.exe.
You can use the Outlook file repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. This freeware Repair tool monitors your Outlook data files on your computer to see if they're in excellent appearance.
Repair PST & OST File fined Software in your system location

  • 64-bit Windows Vista, Windows 7, Windows 8 and Windows 10
    •    drive:\Program Files\Microsoft Office\OFFICE16
    •    drive:\Program Files\Microsoft Office\OFFICE15
    •    drive:\Program Files\Microsoft Office\OFFICE14
    •    drive:\Program Files\Microsoft Office\OFFICE12
  • 32-bit Windows Vista, Windows 7, Windows 8 and Windows 10
    •    drive:\Program Files (x86)\Microsoft Office\Office16
    •    drive:\Program Files (x86)\Microsoft Office\Office15
    •    drive:\Program Files (x86)\Microsoft Office\Office14
    •    drive:\Program Files (x86)\Microsoft Office\Office12
  • Double-click the scanpst.exe file to open the program.
  • Click Browse to locate the corrupted .pst file
  • By default the .pst files can be located in the following folders:

Using Third-Party tool to Convert OST to PST file.

Many third-party tools are available in the market which is designed to recover the corrupted Outlook mailbox caused by many situations like malware attack, hard drive crashes, oversize of a file. System failure and server break down etc.  I am sharing information top 5 best OST to PST Converter to convert OST file to PST file.

1.    ATS OST to PST Converter:

ATS OST to PST Converter software is designed to work without MS Outlook dependency. This application smoothly scans all flaw data from damaged OST file then instantly repair, recover and convert all repair data into newly created PST file and other formats such as EMLX, MBOX, MSG, vCal, vCard, EML include with Mailbox item. It gives 100% Affiance to the users that all items migrate directly into cloud-based application Office 365 & live Exchange server and it also supports window server 2003, 2007, 2007 R2, 2008, 2008 R2 up to 2016. Read More...

2.    InQuit OST to PST Converter

InQuit OST to PST Converter is a very professional and safe application to export OST file data into PST data file. It supportable MS Outlook version 98, 2000, 2002, 2003, 2007, 2010, 2013, 2016, 2019 and the version of MS Exchange Server up to 2016. OST Recovery Software is capable to migrate OST database directly into Live Exchange server and Office 365. So it helps the users to store the OST data on the cloud-based application for future use. Read More...

3.    OST4 OST to PST Converter

OST4 OST converter tool is perfect & wonderful software to repair corrupted OST File data such as emails, Contacts, Calendars, and archive file and convert into Outlook PST File. This software can convert OST file to EML, EMLX, MBOX, MSG, vCal, vCard and HTML file with export cloud base application office365, Outlook.Com and Live Exchange Server. Read More

4.    SysVita Exchange OST Recovery

if your OST files get corrupted and you are in misery how to get back your lost OST files? Here is the Sysvita Exchange  OST recovery tool to repair, recover and convert your orphan OST file into PST and another file format such as EMLX, MSG, MBOX, vCal, vCard, and HTML. It is very simple to migrate data including Emails, draft, inbox, calendar, sent-items, delete-items, task, attachment and metadata properties such as cc, bcc, to, date and time. With the help of this application, you can divide your large OST file into multiple PST file. You can try the demo version of the software that converts 30 emails per folder in any format without the penny.

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5.    Vartika OST To PST Converter

Vartika OST to PST Converter Software is an amazing tool to easily repair & recover OST file into Outlook PST file. This software convert OST file to PST, MSG, EML, EMLX, MBOX, PDF, NSF file. This software can export offline OST file to office365 & Live Exchange Server. Read More