We are trying to migrate our email server from exchange 2003 over to 2007 as the first step in our move to exchange 2013. So far, everything has been pretty smooth. I believe that the new server is all configured based on that fact that the ExchangeActiveSync works when I point my phone at it, and I am able to both send and receive mail through it on my phone. The autodiscover service is not working, but I'm not sure if it is worth my time to get that working for 2007 because if all goes well, we'll be on 2013 in less than 2 months, and we do not use Outlook Anywhere yet. I have not yet moved any mailboxes, because I want to make sure that no mail gets lost, and mail will still be delivered to the new server. To verify that, I created a new user with a mailbox on the new server, and sent it a few messages. The test account will not receive any emails. The test account CAN SEND, but can not receive. We do have an email security appliance that acts as the initial point of contact, and a nat rule that directs OWA traffic, but I do not think we have any firewall settings that would block mail flow from the appliance to the exchange server. Has anyone seen anything like this? Likewise, does anyone think it is worth configuring the autodiscover or would you also skip it? Looking forward to hearing any insight you may have.