a few problems Rated 3 out of 5 stars
I appreciate the effort that went into developing this add-on. In the interest of helping improve it, here are the bugs I've noticed:
1) Message preview panel cannot be resized (even though I get the two-arrowed cursor when I hover over the horizontal divider).
2) Alarms don't sound for tasks.
3) I sync my calendar with my Google Calendar, but if the Google Calendar info isn't retained when I'm offline, that function is nearly useless. I don't know whether that's a problem with Lightning itself or with the Provider add-on.