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Was a great ... not anymore Rated 1 out of 5 stars
Round about version 14 of Thunderbird this plugin stopped working properly and there's been no resolution it.
At one time this worked so well our entire organization decided to use it for their calendars since the larger university was using Thunderbird as their supported e-mail client but then all of a sudden, with the upgrade to version 14 and every one since, Thunderbird became essentially unusable if the Lightning plugin is installed and enabled.
We're now in the process of evaluating new e-mail clients and calendering options for our organization.