Many of you are still running Exchange 2003 and it is working just fine. Exchange 2007 is the current active release and Exchange 2010 will be released the end of 2009, according to Microsoft.
The question for many of you is whether or not you should upgrade to Exchange 2007, or simply wait and upgrade directly to Exchange 2010 skipping Exchange 2007 altogether.
To help you make the decision, here are some deciding factors.
- What is the age of the hardware currently supporting your Exchange 2003 environment? Can your existing hardware provide good email service until you move to Exchange 2010?
- What are your budget constraints? Can you afford to purchase Exchange 2007 CALs this year and then purchase new CALs again for Exchange 2010?
- What are your resource constraints? Can you afford the staff resources to perform the Exchange 2007 migration now and then repeat the process again in 2010?
- What are your functionality demands? Do you require support for unified communications now, or can you wait until 2010?
Your decision to remain on Exchange 2003 and wait another year for Exchange 2010 will largely be shaped by these cost and resource related concerns. There is no technical requirement to upgrade to Exchange 2007 before you migrate to Exchange 2010.
When you eventually upgrade to Exchange 2010, you will require complete new server hardware, so plan accordingly.