Aryson Thunderbird Backup Tool is the best tool to successfully backup Thunderbird Mailboxes to PST and multiple file formats such as PDF, EML Office 365, and Gmail on your Computer, System, or PC. it allows users to migrate Thunderbird mailbox to Office 365, Gmail, Yahoo Mail, AOL, Hotmail, IMAP, Zoho Mail, and iCloud. The software works on all Windows versions, like 11, 10, 8.1, 8, 7, Vista, XP, etc. It has a feature to save the backup file in a specific location.  It maintains folder hierarchy throughout the backup process of Thunderbird emails.