Outlook 2013 Sychronization

I have Outlook 2013 and I keep getting this message: 2 of 4 folders synchronized. It used to be 3 of 4 but never 4 of 4 folders synched.  It then shows a synching error.   How do I fix this problem?

Secondly I cannot recall what my Outlook password is, I get a prompt asking me for the password.  My question with that is: How do I retrieve that password or how do I change it?  I would appreciate any help possible.

Thanks