Importing a PST file into Office 365 can be done using different methods, depending on the PST file size and the number of mailboxes involved.
The most reliable method is the Microsoft 365 Import Service. In this process, the PST file is uploaded to Azure storage using the Network Upload option. After the upload, a CSV mapping file is created to link the PST file with the target Office 365 mailbox. Once the import job starts, Microsoft 365 processes the data and delivers emails, contacts, calendars, and other mailbox items securely while maintaining data integrity.
For smaller PST files, Outlook’s Import/Export option can also be used. You add the Office 365 account to Outlook and import the PST file using the Import and Export wizard. However, this method is not recommended for large PST files, as it may cause synchronization issues or data corruption.
For large-scale migrations or multiple PST files, using a professional PST Converter from
BLR Tools is the safest and most efficient solution. It ensures accurate PST import into Office 365 while preserving folder hierarchy, metadata, and attachments for a smooth migration.
For a complete step-by-step guide, detailed methods, and best practices, refer to the blog on Read More:
PST Files in Office 365.