How can you downgrade from Windows Server 2008 to Windows Server 2003?

Many customer called and ask is there anyway to downgrade from Windows Server 2008 to Windows Server 2003. Hereby I would like to say : "..It can be done!"

For Original Equipment Manufacturer (OEM) Operating System, it have two different types of downgrade options:
    - Downgrade license (bundle with Windows Server 2008)
      When Windows Server 2008 launched for one quarter, Dell start not to upsell Windows Server 2003. Therefore, the Sales team introduce Windows Server 2008 with Downgrade license to Windows Server 2003. During the installation, the interface slightly different with the usual one, you will see extra options called: "Downgrade" is available to chose.

    - Downgrade media
      If your OEM Windows Server 2008 doesn't come with the downgradeable license (due to price different), you may contact your Sales Account Manager to request a Downgrade Media from Microsoft. Please note that this is not a new license, and it is chargeable.

Please refers to the below for further info from Microsoft.

From an OEM. From now until March 31, 2011, some OEMs may support fulfilling Windows Server 2003 R2 downgrades (includes Windows Server 2003 Web Edition, Windows Server 2003 Enterprise Edition for Itanium-based Systems, and Windows Server 2003 Datacenter Edition for Itanium-based Systems) to their customers. There are several options available. Contact your OEM to determine if it supports downgrade fulfillment. Please note that downgrade media is not a new license for Windows Server. It only enables a customer to install, activate and run an earlier version of Windows Server under a Windows Server 2008 or Windows Server 2008 R2 license.

• OEMs may provide their existing Windows Server 2008 or Windows Server 2008 R2 customers one copy of downgrade Windows Server 2003 R2 media only if their customer requests it.

Some OEMs have pre-activated their software. In these cases, a customer would not need a product key or to activate over the internet or via the phone.For Windows Server 2008 R2 downgrade requests, end customers should fulfill downgrade requests through the Windows Server Downgrade Fulfillment site.