Good Thunderbird support, broken when used in combination with lightning Rated 2 out of 5 stars
Theme has really good integration with used Linux icon theme. I did not suffer from any of the errors reported in other reviews (Quicksearch bar is visible and has correct size, searchbars take fixed amount of space in toolbar (this is not the case when using Elementary.Human)).However, if you are also using Lightning, things get broken... Editing an event will use the current day and time as the events day and time (thus overwriting your calendar data). This is a real issue! Also, the dialog box shown for adding or editing an event is more complex compared to the default one (probably because of the same bug).I would rate this 4 stars if used without lightning, but please be careful when using the addon with the calendar extension! Developer warns for limited Lightning support which is true, but it actually also breaks Lightning, which is a pity!
Tested with Thunderbird 3.1 - Lightning 1.0b2 and Thunderbird 6.0.2 - Lightning 1.0b5
The upcoming update should fix the lightning error for you. The original lightning theme is modified less and works fine now.