Conversion of OST files into Outlook PST is really a tough task and it becomes necessary if your files have been corrupted. In this situation, you will need a converter like ATS OST to PST Converter which has tremendous advantages that help to make the conversion process simple and modest. The user can directly migrate all their database into Office 365 & Live Exchange Server.

Visit here:  https://microsoft-office.wonderhowto.com/forum/best-way-convert-ost-file-pst-file-via-using-ats-ost-pst-converter-tool-0184450/

• Export OST files with attachments into PST format
• Easily Select OST files with Drag and Drop option facility
• Choose output location to save converted OST files
• Supports to move OST to PST without Outlook
• Operable with all new or old versions of MS Outlook
• Preserves OST file integrity and folder structure during migration

Know more: http://dailygram.com/index.php/blog/466237/best-ost-to-pst-converter/

The best option here would be to converts the .ost backups to .pst,

I once tried KdeTools for OST to PST software and it was quite helpful. The ost2pst software helped you in restoring corrupt all OST data and converts OST to PST file format in just a few minutes along with all items. 

http://ost2pst-converter-free.software.informer.com/

Hope it'll helpful for this suggestion ...!

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Unluckily, Microsoft doesn't provide any built-in feature for converting an .ost file into PST format. As one has no other option, a 3rd party OST 2 PST Converter is a ideal solution for this.Now, the important question here is why does one need to convert OST to PST file format in order to deal with corruption. Well, there are several reasons and circumstances that may need you to do so. For example, at times when you do not have access to the mailbox or especially in case of accidental deletion of user mailbox, the OST file becomes completely unusable. By converting the OST files to PST file format, you will get back the access to the inaccessible files and will be able to get back the lost data.

Use the free trial version to see the preview of recovered mailbox.

Download now http://www.filesrecoverytools.com/ost-to-pst-converter.html

 

Use this best OST to PST Recovery software tool to fix Outlook OST file error within minute because this OST to PST Email Converter tool has very good accessbility to restore OST emails into PST file with all attachments .

For more help free Recover OST to PST emails under free demo facility of this OST File Recovery software where you are authorised to save 20 OST emails / folder to PST,EML,MBOX,etc format .

For more about this OST to PST Converter read from this link :-  OST File Recovery