Attachments are an important part of PST mailbox data, so it is worth checking how they are handled before beginning a migration. Choose a method that supports email attachments and verify the imported messages afterward. Keeping a backup of the original PST files is also recommended, especially when transferring business emails or archived correspondence.

For this task, Aryson PST to Office 365 Migration Tool provides a dedicated workflow for moving PST mailbox data to Microsoft 365. Before starting, review the source file and destination settings to ensure the migration is configured for the correct mailbox. A preview, where available, can help you inspect the source data before processing.

When you import PST to Office 365 , check several migrated emails and open their attachments to confirm that the expected files are accessible. Also review the folder structure and message content after the transfer. Avoid deleting the source PST until you have verified the migrated data, since retaining the original provides a reference if any attachment or email needs further checking.