What is the difference between .pst and .ost file ?

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Accepted Answer

PST is a personal storage table used by Outlook to store emails and other items, while OST is an offline storage table used for cached Exchange mode.

PST is a local file that stores emails, contacts, calendar items, and other data in Outlook.
OST is a copy of data from a user's mailbox on an Exchange server that is stored on the user's computer.
PST files can be imported and exported, while OST files cannot.
OST files are used for cached Exchange mode, which allows users to access their mailbox even when offline.
PST files have a size limit of 2GB in older versions of Outlook, while newer versions support larger sizes.
OST files are automatically created when a user enables cached Exchange mode in Outlook.

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