15 minute delay between internal 2003 & 2010 Exchange

I have 2 Exchange systems, a 2003 & a new 2010.  User 1's mailbox is on Exchange 2003 & user 2's mailbox is on 2010.

When user 2 sends email to user 1 there is an up to 15 minute delay in user 1 receiving the email.

When user 1 sends email to user 2 there is no delay in user 2 receiving the email.
someITGuyAsked:
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AmitIT ArchitectCommented:
Check this

http://support.microsoft.com/kb/2009942

Secondly, open the tracking logs and see where it is stuck. I think you must remove Exchange 2003.

Check below article
http://support.microsoft.com/kb/2009942
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BCipolloneCommented:
Is there a spam blocker or virus scanner between the 2 that may be slowing down the delivery? Do you see anything in the event logs?
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AmitIT ArchitectCommented:
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