Ans - The Office 365 Backup Tool is best for saving emails from Outlook 365 to hard drives. Download and install Aryson Office 365 Backup software and choose Use Modern Authentication. Sign in with your Office 365 account. Select Mailbox/Online Archive or Public Folder and proceed. Pick the folders to save, choose PDF format, and customize features. Select the hard drive location to save the PDF file. Click Convert to complete the process.