What is the reason to import a PST file to Thunderbird? Mozilla Thunderbird is an open-source desktop-based, free, and email-management program that enables users to manage professional and personal information such as emails, attachments chats, contact information etc. You can easily use it on multiple platforms like Windows, Mac, Linux, and Ubuntu operating systems as it is platform-independent. It utilizes ".mbox" as its standard file format used to store mailbox information, and is compatible with other email client software applications, such as AppleMail, Netscape, Spicebird, SeaMonkey, Eudora, and so on. Other factors create Thunderbird an efficient and reliable tool for users to transfer PST mail to Thunderbird. Thunderbird is compatible with a variety of operating systems such as Windows, macOS, UNIX, Linux, and Ubuntu. Additionally, it is regarded by many as the most trustworthy and secure email client available to Windows as well as Mac users. Filters spam and enable users to filter out email that are spam. It has better security features than Outlook. It has a one-click archive feature which saves the chosen emails to the form of an archive. It is possible to upload the huge files directly to pCloud using the aid of Thunderbird. It provides a number of unique tools to manage data with ease. Simple email management, Easy search and filtering, tag, and viewing of emails. You can integrate it into several email clients because it is compatible with different protocols like IMAP, POP3, SMTP.