Workaround: start with option -allow-downgrade.

New: To protect your profile data against a downgrade, Thunderbird 68 may display a message 'You have launched an older version of Thunderbird' and will not allow opening a specific profile.New: Full Unicode support for MAPI interfaces: New support for MAPISendMailW.New: Added a policy engine that allows customized Thunderbird deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file.New: On Windows a 64bit installer and MSI package are now available, see the Thunderbird for Organisations page for details.Preference needs to be set (and possily also needs to be set to false) New: Language packs can now be selected in the Advanced Options.New: Mark all folders of an account as read.New: File link attachments can now be linked to again instead of uploading them again.Not updating your Windows timezones will result in unreliable and erroneous display and entry of time data! Be sure to do this. Information on obtaining the updated timezones can be found in Microsoft Knowledge Base article 955839. IMPORTANT: Install the updated timezones for Windows XP or later. Windows users must have Windows XP or later. provides Lightning for Windows, Linux and Mac OS X in a variety of languages. Please check the Thunderbird or Seamonkey release notes for more details.īefore installing, make sure your computer meets the system requirements. Lightning requires slightly more processing power and memory than the equivalent version of Thunderbird. Lightning is compatible with Thunderbird and SeaMonkey. Lightning is licensed under the MPL/GPL/LGPL triple license, allowing use of the files under the terms of any one of the Mozilla Public License, the GNU General Public License, or the GNU Lesser General Public License. Please support our efforts by donating to the Calendar Project. Since it's an extension, Lightning is tightly integrated with Thunderbird, allowing it to easily perform email-related calendaring tasks. Lightning brings the Sunbird calendar to the popular email client, Mozilla Thunderbird.

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