If you want to convert any offline OST to PST files then you can go with eSoftTools which recommend you best tools that can easy to use for all users and provide you instant results. this multifunctional capable to convert your offline OST data to other files like MSG, EML, EMLX, MBOX & VCARD and also support the Office 365 cloud. The tool is available to split the recovered large PST file after the recovery of the OST file. There is no requirement of MS Outlook and Exchange for recovery. The company is providing you free demo feature link is down below.
Read More Info- Convert OST to PST office 365
You can use frequent third-party apps to determination your difficult. Really this happened with many users that occasionally they are not accomplished to access their OST files due to some faults. At that time they require to import their OST file while converting it into PST format. Here is one OST to PST Converter Software by which you can export your OST file into Outlook PST.
Visit here: https://www.sametools.com/convert/ost/
ATS OST to PST Converter is one of the most recommended tools to recover Outlook mailboxes, contacts, calendar, tasks, notes etc. from corrupt OST file and convert the recovered data to PST, MBOX, MSG, EML, EMLX, vCard & vCal formats.