SBS Exchange migration to external Exchange

We have migrated mailboxes from an in house SBS Exchange server to a Hosted Exchange server.  But, when we setup the outlook profiles, they connect fine, but in a minute they get prompted with a certificate from the old server and start getting prompted for a password from the old server name.  Then, it changes the Exchange proxy settings to the old server info.  How can I fix this?
HappyNBAsked:
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KimputerCommented:
Check ALL the required DNS changes necessary (the hosted Exchange should've provided those to you already, or if you use MS services, it's shown to you step by step in the domain setup in the admin pages), and input them in your DNS server.
HappyNBAuthor Commented:
We found the issue.  We had to put a http redirect on the local IIS server for Default WEbsite > Autodiscover and redirect it to http://EXCHANGE PROXY SERVER/autodiscover.

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KimputerCommented:
You're redirecting to another server. But as I said, you should have used the correct DNS settings, that means, the redirect wasn't necessary if you read through all the DNS settings needed.
Here's what I asked

DNS:
autodiscover old > autodiscover new

Here's what you did:

Not the correct DNS changes
Outlook uses old autodiscover settings > YOU redirect to the new server.

It's fine by me that your award your WORKAROUND as the answer, but the real answer was what I said, check your DNS settings.
HappyNBAuthor Commented:
No one else answered
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