To
import a Yahoo mailbox to Office 365 with attachments, you can start with the manual approach using Microsoft Outlook as an intermediary. First, configure your Yahoo Mail account in Outlook using POP or IMAP settings, allow access from Yahoo security settings, and sync all emails with attachments to Outlook. Once the data is downloaded, export it as a PST file and then upload that PST into Office 365 using Microsoft’s import methods.
Although this method is free, and has several limitations. It is lengthy, requires technical expertise, depends heavily on Outlook configuration, and may cause issues with large mailboxes or missing attachments. To avoid these challenges, the
CloudMigration Yahoo Backup Tool is a better option. It directly migrates Yahoo mailbox data, including all attachments, to Office 365 with complete accuracy, faster processing, and no risk of data loss, making the migration simple and reliable.