imap folders

When I open Outlook, my IMAP folder looks like this. When I expand the Inbox, it looks like this. I end up with 3 trash folders (yellow), 3 junk folders (blue), 3 sent folders (green), and 2 draft folders (red). What is in these folders is very confusing. For example, the Sent and Sent Items...

My office recently changed our email addresses from @suddenlinkmail.com to @____ (a vanity address). We are still with Suddenlink and we do not have Exchange. Prior to making the switch, I was able to view all of the folders I created in my Outlook on my iPhone 6, and file any emails on my...