
Regarding support improvements, we can find that support for message forwarding is included, macOS device support equipped with an ARM chip from Apple Silicon (M1), support for encrypting messages sent to recipients specified in the Bcc field and that the conclusion of the recommendations to replace incompatible or discontinued plugins was implemented. Added support for automatic detection of external calendars, added an item to the context menu to start editing, show category colors in drop down lists, provide the ability to launch ics files by double click, support for importing sorting and filtering parameters. It is also highlighted that the capabilities of the calendar planner were expanded.

There are three modes available in the "View -> Density" menu: compact (minimal indentations), normal and touch (large indents and large icons for easy operation on touch screens).Ī floating dialog has been implemented that appears when you try to move a file to a window in drag and drop mode, and allows you to add this file as an attachment or embed it as an image. In addition, various interface design modes have been implemented, adapted for different sizes and screen types. After completing the account setup, additional options are offered, such as adding a digital signature or configuring end-to-end encryption. The interface for setting up a new account has been completely redesigned and now it opens in a new tab, instead of a separate window.

User interface customization options have been moved to the View menu. In this new version of Thunderbird 91 we can find that interfaces have been redesigned for initial setup and printing. Thunderbird 91 is based on the ESR version of the Firefox 91 codebase The new version is classified as a version with long-term support, whose updates are published throughout the year. One year after the release of the last major version of the Thunderbird email client, the release of the new version 91 has been announced which is developed by the community and based on Mozilla technologies.
