Exchange 2003 2010 Issues

We have a new 2010 Exchange server we moved teacher accounts to the new server and left student accounts on our Exchange 2003 so when students log on they go to that server. Heres are issue the students can reach their email server exteranlly outside the network but internally they can not. Help

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Niko6323Asked:
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MNH1966Connect With a Mentor Commented:
I don't have a direct answer, but I can advise you to carefully review the steps in:
http://technet.microsoft.com/en-us/library/aa998186.aspx

Coexistence should work fine, but there are some prerequisites!
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XCONBLRCommented:
When you say that they cannot reach the server, does that mean that they cannot log into their mailbox?
If yes, are they logging into their mailbox using OWA or Outlook?
Is Outlook continuously prompting for credentials?

When they are able to logon from external network, that means that there is no issues with their mailbox.
When they are unable to login from internal network, they are trying to use Integrated Windows Auth.

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Niko6323Author Commented:
!!!!!!!!
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