Cpanel Migration email problem

Hey all. I have migrated all my accounts from one cpanel server to another. All the existing accounts, databases and mail have been migrated.

Also, I have tested mail on one of the accounts and sent a message to it, and the mail did show up on the server through horde.

The problem I have now, is that, I had setup several of my mail to download to my Microsoft Mail on my desktop, and for some reason on those accounts, the mail is stopping at the login/username prompt in Outlook/Windows Mail.

This shouldn't be happening because the usernames and passwords for all the accounts stayed the same, and the nameservers and dns has all been forwarded to the new IPs.

Can somone possibly point me in the right direction?

I also checked the mx records, and they are all pointed to the correct domain names as they were before.

Also, I updated the A Names to the new IP's through that option in the base configuration page of cpanel/whm.

Thanks in advance for any words of advice.