Email Migration - Have some old messages - Can't receive any new messages

We migrated yesterday, even though we downloaded the Outlook Assistant and got the A-OK in that app, I still had to add the account following the directions in the Microsoft link from the email to get it to load in our Outlook 2010.  When I did, our old email inbox loaded (none of our folders or the emails contained in them did though, those are gone??). We can send a message out, but we cannot receive any new emails in.  When Outlook searched for the settings it didn't find secure settings to use for our account so it connected via unsecure. Is this why I cannot receive messages and where can I find the correct settings to manually set it up?  I have also tried on my iPhone and the same thing happens, I can load the inbox and all messages that were sent before the migration time, but none that have come in after migration.