If you want to recover Deleted OST file, then you can go with SysInspire OST to PST converter software. This tool has a feature to import all mailbox items.  It supports many file formats for conversion, users can change the OST file into PST, EML, EMLX, Office 365, HTML, etc., it has 10+ file formats for conversion. It can import all mails with attachments. It can show the preview of the OST file after conversion. It can support all versions of Windows OS. even it can even support all versions of Outlook.it has a demo version users can convert 25 OST files for free. It has technical support all users can get help by mails or live chat.

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