STILL needs PDA sync! Rated 2 out of 5 stars
Product is decent enough, as far as it goes, but without PDA/smartphone sync for Palm and Windows Mobile devices, to say nothing of BlackBerries and iPhones, Lightning/Sunbird is a non-starter for many people (me, for instance). I would bet that Thunderbird usage would skyrocket if only Lightning with PDA/smartphone syncing became available.
This serious shortcoming has been a source of complaints since at least late 2006 - an ETERNITY in the software world. WHY are you dragging your feet so badly on adding this essential feature?
Also, Lightning/Sunbird needs better import/export tools - MUCH better in fact. Won't import or export to enough formats. HTML email is often messed up in the importing process and it is often easier to transfer addresses BY HAND than to fix the terribly mangled results of an address book import!
Good God, people! This project has been going more than long enough for it to have reached a decent level of polish by now!