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When you setup 2007 and new routing group connector is create between the 2003 and 2007 which handles mail flow between the 2.<br />
<br />
Common issue that have caused problems:<br />
Try disabling AV on the 2003<br />
Verify your smtp virtual is not forwarding to a smart host
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When you setup 2007 and new routing group connector is create between the 2003 and 2007 which handles mail flow between the 2.

Common issue that have caused problems:
Try disabling AV on the 2003
Verify your smtp virtual is not forwarding to a smart host

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Dear All<br />
&nbsp; &nbsp;i have recently set up an exchange 2007 64 bit server , after a few initial install problems it seemed to install ok and pick up the mailbox entries etc from the old server. if i move a mailbox to the new server it no longer accepts mail from the 2003 server or external mail and yet the mailbox's moved to 2007 will talk to each other. &nbsp; i tried moving just a couple of box's to make sure everything worked ok (email can not go offline for more than a few minutes in our organisation) what am i doing wrong? do i need to migrate them all across and will i loose external connectivity?. the domain i have installed exchange 2007 in is part of a forest , will this effect connectivity to other donmains in the forest.<br />
&nbsp;help greatly appreciated 
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Dear All
   i have recently set up an exchange 2007 64 bit server , after a few initial install problems it seemed to install ok and pick up the mailbox entries etc from the old server. if i move a mailbox to the new server it no longer accepts mail from the 2003 server or external mail and yet the mailbox's moved to 2007 will talk to each other.   i tried moving just a couple of box's to make sure everything worked ok (email can not go offline for more than a few minutes in our organisation) what am i doing wrong? do i need to migrate them all across and will i loose external connectivity?. the domain i have installed exchange 2007 in is part of a forest , will this effect connectivity to other donmains in the forest.
 help greatly appreciated 

moving mailbox's from exchange 2003 to 2007 cross connectivity?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).