Edgetranport process consuming all memory


I have recently installed exchange 2007 server in co-existance with exchange 2003.  The process edgetransport.exe on the exchange 2007 consumes more than 5GB of memory and causes the routing group connector between the exchange 2003 and exchange 2007 servers to stop working.  All internal and external email queue in the routing group connector on the exchange 2003 server.  All user mailboxes reside on the exchange 2007 server, as a result no emails are sent or received by users.

I receive the following error in the event log of the exchange 2007 server:

Resource pressure increased from Normal to Medium:

Resource utilization of the following resources exceeded the normal level private bytes = 73% (medium)...

Back pressure caused the following components to be disabled:
Inbound mail submission fron the internet
Mail submission from the pickup directory
Mail submission from the replay directory
Loading of email from the queuing database

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Do you have exchange 2007 SP1 and the latest roll up installed?
Do you have any AV on the server?
What other roles are installed on the server?
InoAdminAuthor Commented:
Yes Exchange 2007 SP1 is installed with latest updates.  Trend Office Scan Client is the only AV installed on the server.  Installed Server Roles:   Mailbox, Client Access, Hub transport.

Also noticed this event:

Event Type:      Error
Event Source:      MSExchangeTransport
Event Category:      Routing
Event ID:      5015
Date:            11/20/2008
Time:            6:26:57 PM
User:            N/A
Microsoft Exchange cannot find a route to the source transport server or home MTA server CN=Microsoft MTA\0ADEL:0cd86336-2ef5-4ef7-a966-cc55baee1722,CN=Deleted routing tables with timestamp 11/20/2008 4:26:57 PM. Microsoft Exchange is ignoring the source transport server.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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I'm not sure how this resolved the issue.  I am having the same problem, and this did not really help.
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