If you want to reset the OST file in Outlook, here I suggest downloading eSoftTools OST to PST converter software. It has 10+ file formats for conversion of OST files. It supports all versions of Windows OS. This tool has a demo version that allows users to convert 25 items from each folder. This tool provides an email filtration option so users can convert specific dated emails and convert them into PST files. With the help of this tool users import OST mailbox to the Office 365 cloud. It shows the preview of OST file.
