In such cases, the users can continue to work on Outlook without interruptions. OST enables users to access their Outlook even if the system is offline or the Exchange server experiences downtime due to technical issues or maintenance.
In a nutshell, an OST or PST file is a replica of the user’s mailbox as it stores all mailbox items, such as emails, attachments, contacts, notes, calendar items, etc. These Outlook data files (OST and PST) contains a synchronized copy of all mailbox data that is stored on the email server. Similarly, when you add a POP account to Outlook, a Personal Storage Table (PST) file is created. When MS Outlook is configured with an Exchange or IMAP-based email account, an Offline Storage File (OST) is created on the local system.
