I recommend you to get SysInspire OST to PST converter software. This tool can fix error OST file missing Outlook 2016. This tool can convert OST file into multiple file format such as EML, EMLX, Office 365, HTML, Office 365, Yahoo Mail, Gmail. Etc. It has a demo version users can convert 25 items from each folders. It has a technical support all users can get help by mail or live chat. It has recovery option users can recover deleted mails and convert them into PST file format. It can export emails with attachments. It can support all version of Windows OS.