ActiveSync issues with iPhone and Exchange 2003

I have a SBS 2003 Standard with SP2 on a simple 8 workstation office. I have two users with iPhone 4 from Verizon. Everything has been running fine up until a month ago. The problem now is that the iPhones will only sync with Exchange when 1) Their Outlook is opened and connected to the Exchange server or 2) When they authenticate through OWA. If one of those two options are not meet, the iPhone will show that it is connected and updated but it will NOT show any new emails except the ones that came in when one of the two options above was met. As soon as you open Outlook or OWA the emails will populate on the iPhone.

The workstations are Dells with Windows 7 using MS Office 2007.

I have wiped out their workstations and I have replaced their iPhones with new ones and the problem still exists. I have used my iPhone 4 from AT&T and have the same results. The users claimed that this issue didn't start happening until the Apple store messed up both of their phones about a month ago. Could it have something to do with MobileMe? Could it have something to do with corrupt mailboxes? I have other users on the network using their phones with ActiveSync (not iPhones) and no problems. I am not using iTunes to make any communication to Outlook/Exchange.

This problem didn't exist until they switched over from AT&T to Verizon about a month and half ago and had the Apple tech support wipe out their phones.

Thoughts???
billygreenAsked:
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MegaNuk3Connect With a Mentor Commented:
Ensure you are running the latest firmware on those iPhones and if you are have a read of this:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_1798-Exchange-2003-Activesync-Connection-Problems-FAQ.html
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billygreenAuthor Commented:
I also needed to change the registry entry for the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSEchangeIS\VirusScan

Changed the BackgroundScanning and ProactiveScanning to ones (1)

Restarted the Microsoft EXchnage System Attendant
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