Microsoft has announced the upgrade paths available for Windows Server 2008:
| If you are currently running: | You can upgrade to: |
| Windows Server 2003 Standard Edition (R2, Service Pack 1 or Service Pack 2) | Full Installation of Windows Server 2008 Standard Edition Full Installation of Windows Server 2008 Enterprise Edition |
| Windows Server 2003 Enterprise Edition (R2, Service Pack 1 or Service Pack 2) | Full Installation of Windows Server 2008 Enterprise Edition |
| Windows Server 2003 Datacenter Edition (R2, Service Pack 1 or Service Pack 2) |
Full Installation of Windows Server 2008 Datacenter Edition |
A few important points:
1. Except for Windows Server 2008 for Itanium, the above applies for both x86 and x64 versions. Cross-platform upgrades are not supported (Ex: x64 to x86 or x86 to x64)
2. There is no upgrade path for Windows Server 2008 Server core edition (Since this is a new product line)