I am in the coexistence phase of my Exchange 2003 to 2010 migration and everything is going well. I have reached a point where I have to create a new user. The user must be created on the legacy exchange server, due to third party applications that are not ready. Everything works perfectly, except for activesync. I cannot get a new user's (existing users are fine) iphone to retrieve mail from the legacy server. It configures on the device and verifys that everthing is fine, but it will not retreive or send mail or connect to anything. I also created a test user, and the same thing happens.
Is this expected behaviour at this phase does anyone know?