You can also use an Outlook Data File (.pst) to backup or export items from any type of email account. For more information on backing up your email messages, calendar, contact, and task data, see Export or backup email, contacts, and calendar to an Outlook .pst file.

Windows 11 in S mode is designed for security and performance, exclusively running apps from the Microsoft Store. If you want to install an app that isn't available in the Microsoft Store, you'll need to switch out of S mode. Windows 11 in S mode is only available in the Windows 11 Home edition.

To learn how to import items after you've exported them, see Import email, contacts, and calendar from an Outlook .pst file. Note: Exporting and importing a mailbox using a .pst file isn't supported in new Outlook at this time.