Hi,I'm in the process of migrating from exchange 2003 to exchange 2007. I've gone through the process and everything seems ok, except once or twice each day the server stops sending/ recieving mail and the messages queue until I restart the topology service. Obviously this is is stopping mefrom migrating any more than the 10 or so test users I have already migrated.I've enabled full logging,to diagnose it a bit further, and each time the server starts queuing e-mailsit appears to go through the same process of the edgetransport.exe doing a topology scan followed by a couple of LDAP connections to ConfigDCNotifyPool &ConfigDCPool. Then event ID 16022 is logged stating a configuration update has completed after which a series of errors are logged such as:event ID: 4004 -'Transport' rule collection could not be loaded because of configuration errors.event ID: 5020 -The topology doesn't contain a route to Exchange 2000 Server or Exchange Server 2003 server [SERVER NAME].event ID: 5006 - A route to mailbox server could not be found.event ID: 5015 - A route to transport server could not be found/event ID: 5016 = A route to connector could not be found.There's a few others but it looks like for some reason it loading a blank configuration from the DC, however it sucessfully reads the configuration several times throughout the day. It's actually run completely stable for 9 days at one point before the issue came back. Any help appreciated as I'm at a loss as to what could be causing the issue.Thanks,Nathan.

Hi,Whether any security software exists in your environment?At first, I suggest we delete and recreate the Routing Group Connector for the Exchange 2003 and Exchange 2007. After that, please test this issue.ThanksAllen