Need help!

I've used my msn.com account as the primary for many years-- its my link to many business and family contacts and has hundreds of important messages stored.

When I changed my primary to a live.com account today, I have lost all access to the MSN account, and I cannot set it up as an alias-- I cannot even find it. All the mail sent to the MSN account are bounced back as undeliverable.

Please help!