If you want to transfer multiple Yahoo Mail accounts to Outlook securely, you can use the Aryson Yahoo Mail Backup Tool. First, generate a third-party app password for each Yahoo account to ensure safe login. Install the software, log in to each account, and select the mailbox folders you want to migrate. Choose PST format, which Outlook supports, and the tool will preserve all emails, attachments, and folder hierarchy. You can also apply date filters to migrate emails from specific periods. For multiple accounts, repeat the login and backup process for each Yahoo account, saving the resulting PST files separately. The software supports migration to other clients like Gmail, Office 365, Thunderbird, and IMAP. Its advanced algorithm ensures fast, secure, and complete transfer without data loss, making it ideal for users who manage several Yahoo accounts and want a reliable, organized migration to Outlook.