As we know, Office 365 comes with many attractive features, that's why many Exchange and Outlook users are migrating their data into Office 365 account. And I also found that most of Office 365 users want to export their mailboxes into PST as a backup file. If you also want to export your Office 365 mailboxes into Outlook PST files, then you can go with a professional Exchange Recovery Manager tool.

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Once you import the OST file to Outlook, you can access the email, calendar, and contacts stored in it, just like any other email account. You can also go for any third-party Regain OST to Office 365 Migration software. If you are using Office 365, you can open an OST file by following these steps:

1. Access Outlook and navigate the "File" tab in the top left corner.
2. From the "Account Information" section, click on the "Account Settings" button.
3. From the "Account Settings" window, select the "Data Files" tab.
4. Click the "Add" button to open the "Open Outlook Data File" window.
5. Please navigate to the location of the OST file on your computer and select it.
6. Click "Open" to add the OST file to Outlook.

Get more detail visit this post - Import offline OST to Office 365

The main reason to export the Office 365 mailbox to PST is the backup of necessary emails to prevent any data loss. The CloudMigration Office 365 Email Backup Tool is the most reliable and secure solution to export Office 365 emails to PST. Other than PST files, it can export Office 365 to MBOX, MSG, EML, CSV, PDF, and other formats. With this tool, you can backup multiple Office 365 emails which saves your time and effort. Also, it allows you to migrate Office 365 to Gmail, AOL, Yahoo Mail, etc. Moreover, you can migrate Office 365 emails of a particular date range by applying its date range filter.