Migrating PST files to Office 365 is useful when you want to move old Outlook emails to Office 365 and access archived emails online. To avoid losing important emails and attachments, choose the right method that preserves complete mailbox data. You can use manual ways like Microsoft's PST import service through the Microsoft purview portal. In this approach, create an import job, upload PST files, and prepare a CSV mapping file to assign each PST file to the correct mailbox. After validating mapping detail, start the process and verify the details into the designation mailbox. But the process requires technical knowledge and it can be time-consuming.

You can use alternative solutions like MailsDaddy PST to Office 365 Migration tool. The tool transfers PST emails, contacts, calendars, and other mailbox data directly to Office 365 accounts without losing any data. With this software, you can migrate data in bulk, select specific folders, and import ANSI & Unicode PST file types.