We currently have one Exchange 2003 server and I just set up a new Exchange 2007 server. User mailboxes on the Ex07 server can send and receive, no problem. Users on Ex07 can send to internal Ex03 users and to external addresses, but can not receive any mail (except other Ex07 mailboxes).I also have a problem with public folders, which were just replicated to Ex07 server and now are not available to Ex03 users. I think this may be related to other issue.

A little more info:My Default Receive Connector is set to allow anonymous connections.get-routinggroupconnector find two connectors -- Exchange2007-Exchange2003 Source: Exchange Routing Group Target:CityHallandExchange2003-Exchange2007Source: CityHall Target: Exchange Routing Group we do not have an Edge Transport Server, but do use a smart host device. also assigned a defaultdomain as per KB 944302

Hi,After viewing the description, I am confused. You said user mailboxes on the Exchange 20007 can send and receive without no issue. But user on Exchange 2007 could not receive any mail. This is a contradiction in terms.Did you mean the users on Exchange 2007 can send the email to internal Exchange 2003 user but not receive the email from that users?Could you please describe the issue in detail?ThanksAllen

Sorry for the confusion. My Exchange 2007 mailbox users could send, but could not receive messages. I managed to resolve the problem by deleting the automatically generated connector and creating a new one.