Hi,I have exchange 2k7 on win 2k3, the problem is Edge transport.exe utilizing high memory around 2.5 GBThe number of users is around 100 users.Any idea??

Is it causing you problems? Throwing any erros in the event logs? How much RAM total is in the server?

The total memory of the server is GB 4It is not throwing any errors.

I wouldnt worry about it then. If the Edge Transport .exe experiences any resource pressure, it will throw errors in the event logs.http://technet.microsoft.com/en-us/library/bb201658.aspxUnderstanding Back PressureSince you have 4GB of RAM, I would follow the guidance here and adjust the database cache:http://msexchangeteam.com/archive/2008/05/14/448890.aspxNew maximum database cache size guidance for Exchange 2007 Hub Transport Server role Also, run Exbpa against the server and see if if finds anything.