Follow the instructions on the site for installing Thunderbird. These instructions require Thunderbird version 78 or later. You can obtain a free download of Thunderbird from the Mozilla website. To request access to IMAP, please submit a Help request. With IMAP you can only access your email, not your calendars, contacts, or tasks. Thunderbird does allow IT to design the UI and select features to match the exact needs of its users.Thunderbird lacks Exchange support so it needs to be configured for IMAP. Outlook has many features that Thunderbird needs add-ons to match, such as delayed email delivery and Google Calendar connectivity. Linux and Unix can only run Outlook as a web app. Thunderbird works natively on Linux and Unix. Where Mozilla Thunderbird email excels is its range of compatibility, which Outlook falls short on. IT can work around these problems by using alternate antispam add-ons and working with Thunderbird's linking feature for large attachments. There are even some unresolved bugs that have persisted through several versions of Mozilla Thunderbird email, such as corrupting data in POP3 folders, errors with saving and uploading large attachments, and incompatibility with McAfee Anti-Spam. For example, Mozilla's email developers rely on user reporting to fix bugs. Ultimately, Thunderbird is not as polished as Outlook because Mozilla simply does not have the resources to pour into email client product development. IT may also consider the Internet Message Access Protocol (IMAP), which allows users to access emails stored in a network database and interact with them as though they are local emails. Like other enterprise email clients, IT can design its servers to run Post Office Protocol 3 (POP3), which allows users to move emails from a remote server directly to their devices. Thunderbird supports basic calendar and chat functions.

It also integrates directly with the Mozilla Firefox web browser. Mozilla Thunderbird email runs on Linux, Microsoft Windows and Apple macOS.

Mozilla Thunderbird is a well-known, free and open source Outlook alternative.

Mozilla thunderbird outlook calendar