In Outlook 2016 and Outlook for Microsoft 365, IMAP accounts use Offline Outlook Data Files (. ost). You can also use an Outlook Data File (. pst) to backup or export items from any type of email account.

Is PST POP or IMAP?

Outlook Data Files (. pst) are used for POP3, IMAP, and web-based mail accounts. When you want to create archives or back up your Outlook folders and items on your computer, such as Exchange accounts, you must create and use additional .

How do I create a PST file with IMAP?

On the File menu, point to New, and then choose Outlook Data File. Click Office Outlook Personal Folders File (. pst), and then select OK. In the Create or Open Outlook Data File dialog box, in the File name box, enter a name for the file, and then choose OK.