I am trying to transition from a single Exchange 2007 server to a Standard deployment (1 CAS server and 1 Mailbox server). Is there any documentation as far as steps to accomplish this?

I couldn't find any step by step documentation about this but you need to move all mailboxes and PFs (if you have in your environment incase using Outlook 2003 clients) to new mailbox server and verify all the steps normally require to configure while deploying fresh environment and do necessary server for your new server.Finalize Deployment Taskshttp://technet.microsoft.com/en-us/library/bb125262.aspxEnd-to-End Scenario Taskshttp://technet.microsoft.com/en-us/library/bb124563.aspxAmit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

Hello. Thanks for the input. I have already put in place a secondary mailbox server and started to move some of the mailboxes over. The main problem that I am having is that I can not connect to the secondary CAS server. When I try to connect, it responds with a 404 error.My layout is the initial 2007 server with all roles installed and mail functioning normally. I then installed the secondary mailbox server and moved some mailboxes over. I can still access those accounts via OWA into the first server. Then I tried to install and configure the secondary CAS server, but it does not seem to be working right.

The best way to do this would be to take the first server and leave it as a mailbox server, deploy the second server as the Hub/CAS role and then remove the H/C role from the first server.The problem you are seeing is likely becuase the Cas server is also on the mailbox server.BP

Issue description: Users cant connect to second installed CAS server, error 404 occurred Error 404: The Web server returns the "HTTP 404 - File not found" error message when it cannot retrieve the page that was requested Check info: 1. Please post the full error info of 404 2. Which version of windows server have you used? 3. Wheres your new Hub server? If its not that first exchange server, please follow the step 3 in this article to modify the send connector 4. Quote: can not connect to the secondary CAS server. When I try to connect, it responds with a 404 error: Does the issue happen when you tried to connect OWA on the second CAS server? 5. Is there any further error event in the application log of second CAS server when you try to access? 6. Is there any error info in the installation log of second CAS server? Troubleshooting: 1. Please check the status of the default web site on the second CAS server 2. Please compare the properties of good CAS and bad CAS, see if we can find any difference which cause the issue (Method) 3. Please try to recreate OWA virtual directory (Step 3 in here) Resources: Troubleshooting Outlook Web Access Logon Failures in Exchange Server 2007