Comment 33 for bug 183136

This just happened to a few days ago, when it does my cpu usage goes to 100% or both core start going nuts at over 50 to 60% of usage.
Doesn't affect memory usage it stays low.
Just did:

sudo evolution --force-shutdown
find ~/.evolution/mail/local -name "*ev-summary" -exec rm -f {} \;

and seems to be working for now.
I did a complete re-installation of my system because of the cpu usage thing not realising it was Evil ution. Should have Googled earlier, my bad.