I’m currently looking into the best way to move several years of Outlook email archives into Microsoft 365. We have multiple PST files containing emails, attachments, contacts, and calendar information, and the main concern is making sure the original mailbox organization remains intact after the migration. Since these files belong to different users, manually handling every archive could become difficult to coordinate.

Microsoft provides a native Network Upload approach through Microsoft Purview and Azure. The general process involves assigning the required permissions, creating an import job, uploading PST files to Azure Storage with AzCopy, preparing a CSV mapping file, and then validating the import. This can work well when an administrator has experience with Microsoft 365 administration and only needs to process a manageable number of PST files.

However, for a larger project, I think it is important to first understand the actual migration requirements. Some PST files may contain only historical emails, while others could include contacts, calendars, attachments, and carefully organized folders. Identifying what needs to be moved before beginning the migration can prevent unnecessary data processing.

While researching different approaches, I also came across the DRS Softech PST File Converter. It supports batch processing and provides options to preview PST data before migration. Features such as selective conversion, folder hierarchy preservation, attachment management, and filtering can be useful when administrators need more control over which Outlook data is transferred.

Another consideration is mailbox mapping. When several users are involved, each PST needs to reach the correct Microsoft 365 mailbox. Preparing a clear source-to-destination mapping and verifying the target accounts before migration can reduce the chances of accidentally transferring data to the wrong mailbox.

For organizations planning to import PST to Office 365, it also makes sense to perform a small test migration first. This allows administrators to verify folder structure, attachments, email properties, and other mailbox items before processing the complete dataset.

I’d personally compare both approaches based on the project size. The Microsoft method provides a native way to handle PST imports, while specialized software may offer a more guided workflow for organizations dealing with multiple PST files. Either way, proper planning and post-migration verification are important if the archived data contains business-critical emails.

You can take help of Recoveryfix Import PST to Office 365 tool to import PST files to Office 365 efficiently. This reliable software helps users transfer emails, contacts, calendars, tasks, and other mailbox data directly to Office 365 accounts. It supports bulk PST migration while maintaining folder structure and data integrity, making the process simple, organized, and convenient for businesses and professionals. 

IT teams can simplify PST migration to Microsoft 365 by using MailsDaddy PST to Office 365 Migration Tool. It is designed to make the migration process easier by allowing users to migrate PST files to Office 365 mailboxes with minimal effort. The tool offers enhanced features like incremental migration, selected-folder migration, and migration reports, helping IT teams monitor the process and reduce the risk of missing data.

Also it provides an user-friendly interface for users to migrate emails, contacts, calenars, attachments, and other mailbox data directly to O365 account. MailsDaddy provides a practical approach for organizations handling PST migrations for multiple users while reducing downtime and simplifying the overall migration workflow.

IT teams can simplify PST migration by first auditing and organizing PST files, removing duplicates or unnecessary data, and planning migration batches based on mailbox size. Microsoft 365 supports importing PST files through its Import Service, making it suitable for organizations with large amounts of archived email data.

For smoother results, teams should test a small batch first, maintain a reliable backup, monitor migration progress, and verify emails and attachments after import. Using an automated CubexSoft PST Converter tool can also reduce manual effort and help preserve mailbox folder structure and data integrity.

For users looking to move PST files to Microsoft 365 on Mac, MacMister PST to Office 365 Migration for Mac can simplify the migration process. It provides a straightforward way to transfer PST mailbox data to Office 365 while reducing the need for complex manual steps.

The tool can help users migrate emails, attachments, contacts, calendars, and other mailbox items while supporting selective folder migration for more control over the data being transferred. This can be particularly useful for users handling multiple PST files or moving mailbox data to Microsoft 365.

A dedicated PST migration for Mac solution can make the overall process more organized and reduce the manual effort involved in transferring large amounts of email data. Users can also refer to MacMister’s guide on migrating PST files to Office 365 to understand the available migration approach.