For every bug fixed in Evolution, at least two new are reported, according to my completely unscientific and totally unreliable research ;-)
Seriously, there is so much proposed but unfinished functionality in there that a few folks working on it cannot keep up (not making an excuse, just an observation). Evolution is both an indispensable tool for someone with only OWA/MAPI mail access and a total and utter disaster. I reckon I spend more time every day mopping up after Evolution crashes than any other single thing I do.
Right now, I'm waiting for Evolution to fetch one of the big folders off Exchange, using MAPI. It's been doing that for the last half an hour. And before that, it did fetch that folder, but there were no subjects. So, a rinse/repeat cycle was in order. Fun... ;-)