When your computer is offline, you still have access to your information and can make changes or edits. They store a synchronized copy of your mailbox on your local computer. Offline Outlook Data Files (.ost) are generally used by IMAP, Microsoft 365, Exchange, and email accounts. Most importantly: when you save messages or other items in an Outlook Data File (.pst), the items are available only on the computer where the file is saved. Additionally, PST files support uploads to other email services. pst files are stored directly on your computer, they don't count against your mailbox size on a mail server. Importing information such as email messages, contacts, calendars, and more are also possible. pst, including using it to back up or export items from different types of email accounts. After Outlook 2016 and 365, IMAP accounts began creating Offline Outlook Data Files (.ost). However, IMAP accounts used these formats in Outlook 2013 and earlier versions. These files are typically for POP email accounts. Outlook Data Files (.pst) store messages and other Outlook items on your computer. It's time to take a more in-depth look at the three types of PSTs, Outlook Data File (.pst), Offline Outlook Data File (.ost), and Outlook Group Storage File (.nst). For example, three email accounts have three PSTs, each with a set of emails, contacts, calendar items, and reminder messages. Every email account on your computer has a separate PST.

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