Hence you need to choose a right Regain OST to PST Converter Tool which will help you to recover offline .ost file data and convert them into working outlook pst file.This is a professional utility helps the user in situation when they are unable to open OST file or facing some of following common error messages resolve by OST to PST Converter Software: -

    "Unable to open your default email folders. The file abcd.ost is not an offline folder file."
    “When folders could not be opened. Errors detected in offline ost file abcd.ost. Exit from all mail-enabled applications, and then use the ost to pst converter tool.”
    “Encounter a large numbers of conflict items”
    “Unable to open a selected Outlook items when offline.”
    “Different type of errors when synchronizing Exchange Server mailbox with your OST file.”

Here’s how you can do it –

        - Launch the Program.
        - Scan all the OST files in the desired path.
        - Choose the files to recover that are shown in tree structure.
        - Preview the process and save the files in convenient location.

As discussed earlier, you can store all the recovered data in PST file format, making them easy to access and read. This is one best feature of this tool for which it is designed. But OST to PST Converter is also enriched with other features that you may not know.