Iphone 3 and 4 can not connect to server

We have been syncing e-mail to IPhone for 2 + years, Last night we stopped getting mail on our Iphones and other smart phones.
Using Exchange 2003 server.
Rebooted twice today - not seeing any sync errors in event log
Deleted my account, hard boot of IPhone and recreated account - still getting error “ can not connect to server” in mail
What is strange it is only mail – I can move an appointment and it updates my outlook calendar
Any suggestions much appreciated!

This resolve my problems
With that error noted, a search brought me to a solution:
http://alan.lamielle.net/2009/09/03/windows-7-nonpaged-pool-srv-error-2017
Set the following registry key to ’1′:
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\LargeSystemCache
and set the following registry key to ’3′:
HKLM\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\Size
Explanation of what the reg keys do: http://www.decuslib.com/decus/vmslt99a/nt/tips.txt (scroll to bottom)
Thanks to Alan LaMielle and Mark Russinovich.

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