Syncing with CRM

I am setting up our first campaign and have synced my list view into a mailing list. My questions are below:

1. I saw on another post that after an email is sent the leads status would be opened/bounced/opted out etc and that this would be reflected in CRM - where is the shown?
2. If a lead opts out in Campaigns, is that updated in CRM? If so how and where is it reflected?
3. Our current view is sorted off of lead status, if we go in CRM and change the lead status to one that would remove it from the view at the next fetch would it remove that lead from the mailing list in campaigns?

I am sure there will be more to follow but lets start with this
Cory