Multiple times I was facing this issue and wanted to fix the Outlook OST file missing, but I have no idea how to fix this issue. Then one of my friends suggested that I download eSoftTools OST to PST converter software. This software converts MailBox items. This software has technical support all users get help by email or live chat. It has more than 13+ file formats for the conversion of OST files.
Are you worried about this Outlook opening the OST file without an exchange then I will suggest this Enstella OST to PST Converter Software. This software is one of the OST converter software and easily converts any type of corrupted OST file in convert many conversion formats. Get these smart features for users comport like "Mail filtering" & "Naming Convention" and get this (24x7) Free Technical Support via live chat.