Rated 3 out of 5 stars

There are two important problem with Thunderbird:
- Lightning 1.0 isn't integrated with Thunderbird 3 that is not easy to maintain. I have 6 PC to maintain. It should be a part of Thunderbird 3.0
- There no solution to synchronize Thunbird 3.0 + Lightning 1.0 with a PDA and Windows 7-64bit.
Without these two, I would have give the maximum of evaluation (5 stars)

This review is for a previous version of the add-on (1.0b1).