Thunderbird Finds It Hard To Mimic Firefox’s Rapid Rise, Says Report: A report has been released which indicates that Thunderbird is not flourishing the way Firefox is.
Thunderbird’s major shortcoming is the absence of an integrated calendar, the report says. A future release is expected to fill that void. Once calendaring becomes available, Thunderbird will be much more competitive, the report suggests.
Even so, the study notes that Outlook’s position is strengthened by third-party developers. With hundreds of plug-ins available, Outlook users may be reluctant to switch until Thunderbird offers a greater range of expansion options.
I say give it time. Lightning will help.