A.

You would need to convert an OST file into PST file in any of the following cases:

You need to access the emails from a mailbox that is deleted from Exchange

You are facing issues while synchronizing Outlook with Exchange Server

You need to migrate the email organization to a different platform

You need to recreate or rebuild the OST file in case of an Exchange Server crash/disaster

You are facing difficulty with Outlook Import/Export Wizard

You need to change the location of the offline Outlook Data File (.ost) in Microsoft Outlook

You need to move Outlook OST file to another disk

Or facing an error while accessing OST file –