You're off topic for this forum, which is dedicated to Windows Live OneCare.
If you are not using the Outlook Connector, only paid accounts (and some legacy MSN accounts) have access to Hotmail/MSN mail via Outlook natively using POP. If you were using Outlook to connect to the http account without the Outlook Connector, once your account switched, the method for connecting via Outlook via http without the Connector may have been disabled.
Support for Windows Live Hotmail and other Windows Live programs and services:
Go to http://support.live.com and sign in with a LiveID
Click on the Windows Live service or product you need help with.
If you are not presented with an email support form, but are instead redirected to help.live.com for that service/product, in the page that opens from http://help.live.com select any topic on the left hand side or search for a question in the search box.
The results of your search or the clicked topic appears in the right hand frame, along with a tiny link in the lower right hand corner – “Get more help.”
Click that tiny link and you will get to a page with a link “Contact support”
Click that link and you will be presented with the email support form to fill out. Provide as much detail as possible and you should get a response from support within 24 hours.
Help topics at http://help.live.com
Support for MSN or paid Hotmail Plus - http://support.msn.com
-steve