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Exchange 2010/Outlook 2003 Mail Delay

I am in the process of building a new Exchange 2010 environment on a new domain to migrate off our existing domain and Exchange 2007 environment.  I have 2 sites, both with a CAS/HUB server and a MBX server.  I have a PC with Outlook 2003 with a mailbox on 2010 and my personal mailbox/PC is still on 2007.  With my 2007 system messages between 2007 users are instant, but with 2010 there are delays.  If I send a message from the 2010 PC to my 2007 PC it is instant.  If I send from 2007 to 2010 there is about a 30-40 second delay for the new message to pop up, BUT if I click around Outlook during that time the message comes in sooner.  This also happens for a message sent from my 2010 test account to itself.  Messages sent on 2010 also show to be sitting in the Outbox even after they are received on the other side.  I have rebooted servers, rebuilt mail profiles, checked firewalls, nothing in cached mode, I am out of ideas.  How can I get my 2010 system to run as fast as my 2007 system.
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cbitsupport
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cbitsupport
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cbitsupportAuthor Commented:
Thanks for the quick response,  I am reading these articles now and will post results soon.
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cbitsupportAuthor Commented:
Quickest answer I have ever gotten.  Thank you.

I had to install Update Rollup 3v3 on my CAS servers and then add the registry key HKLM\System\CurrentControlSet\services\MSExchangeRPC\
add subkey of ParametersSystem
add DWORD of EnablePushNotifications value 1

This made my Outbox empty in 2 seconds and new mail to pop into Outlook in less than 3 seconds.  Totally fixed my problem.  Many Thanks!!
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cbitsupportAuthor Commented:
It was actually the link the second article that was the solution
http://support.microsoft.com/default.aspx?scid=kb;en-US;2009942
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