As many organizations are thinking of skipping Exchange 2007 & moving directly to Exchange 2010 from 2003, I thought it is a good time to go through the process. The entire topic will be covered through multi part posts. I will base the entire series on my environment. Details of my network is listed below.
- Domain HEW.LOCAL (How Exchange Works)
- Domain Controller - 2003DC, running Windows 2003 R2 SP2
- Exch 2003 Back End - 2003BE, Exchange 2003 SP2 running on Windows 2003 R2 SP2
- Exch 2003 Front End - 2003FE, Exchange 2003 SP2 running on Windows 2003 R2 SP2
- Exch 2010 CAS&HUB - CASHUB, Exchange 2010 running on Windows 2008 R2
- Exch 2010 Mailbox - 2010MBX, Exchange 2010 running on Windows 2008 R2
- 2003 OWA URL – mail.howexchangeworks.com/exchange
- 2010 OWA URL – webmail.howexchangeworks.com/owa
In this post, we will discuss the requirements for Exchange 2010 to coexist with 2003 in the same active directory domain. I already have a 2003 domain up and running with Exchange 2003 Front/Back End configuration. I have also installed two member servers with 2008 R2 (CASHUB & 2010MBX). Before we introduce an Exchange 2010 server, the following points have to be checked.
1. The AD forest & domain functional level has to be atleast Windows 2003. Launch AD Domains & Trust, select the domain name, right click & select properties. Make sure the forest & domain functional level reads “Windows 2003” or higher. In my environment, I have both functional level at Windows 2003.
The rest is on :