I don't know what you mean by your old POP folder. You should get Android access to Hotmail through MAPI, not POP. If you're using POP, you've got a problem.
On Android, from inside your email app's inbox, if you hit the settings button and then select "Accounts', do you see your Hotmail account?
Are you choosing to view the ""Combined Inbox"? Are you choosing to view the inbox for just one of your email accounts?