You can quickly try free outlook ost file recovery software to restore outlook ost file and also recover ost file to pst file. The ost to pst recovery tool to recover damaged files of outlook ost. By using this tool you can conversion  as open ost files data in new outlook pst file. It is the rightly scans unable outlook ost file. Freeware outlook ost to pst import tool to transfer ost2pst file, Office 365 account, pst file, EML, EMLX, MSG, HTML, MHTML, MBOX, VCF, CSV, ICS, Live, Exchange Server, Zimbra, Gmail, Yahoo, and etc.   

outlook ost converter

If you are having trouble in the conversion of the OST file to Gmail format. You can use OST to Gmail Converter which will work without any issues for you. The utility assures you no loss of any data file and no compromise with file quality.

More Info:- https://www.softakel.com/ost/gmail/

Thank you for providing this information.

Thanks,

best smm panel indian