Outlook Data File Cannot Be Opened OST

OST file is very helpful to solve the problem of interrupted or limited internet connectivity by allowing the users to work offline. With the help of OST file, users can draft emails, set reminders, etc. even if they have disconnected to the mail server. Later this Outlook OST file is synced to the Exchange server and the emails composed offline are sent when the connectivity is established. So let fix the error Outlook Data File Cannot Be Opened.