upgrade to 2008 facts

Upgrading to 2008 Facts

you can upgrade a 32-bit Windows Server 2003 to 32-bit Server 2008
and an x64-based Windows 2003 server to x64-based Server 2008, but you can't upgrade a 32-bit Windows 2003 server to x64-based Server 2008. Upgrades from Windows 2003 for Itanium-Based Systems to Server 2008 for Itanium-Based Systems are not supported, and you cannot upgrade from any OS to a Server 2008 Server Core installation; Server Core is always a new installation or an in-place upgrade on itself. No in-place upgrade path exists from Windows Server 2000 or Windows NT Server to Server 2008.

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Upgrades are really only practical for Windows 2003 systems running OS components
and nothing else. Just because the OS can be upgraded doesn't mean that the software running on the server will support an OS upgrade process. For example, Exchange Server 2007 SP1 will run on Server 2008, but Microsoft will not support an in-place upgrade of x64-based Windows 2003 to x64-based Server 2008 with Exchange installed. Software wouldn't let the 2008 server boot if the driver is unsigned

New Features in Windows Server 2008

#1: Server Core.

#2: PowerShell.

#3: Windows Server Virtualization

#4: Windows Hardware Error Architecture (WHEA).

5: Address Space Load Randomization (ASLR).

#6: SMB2 network file system.

#7: Kernel Transaction Manager.

#8: Clean service shutdown.

#9: Parallel session creation.

10: The self-healing NTFS file system.

Windows Server 2008 is the most substantial upgrade to the Windows Server product line since Windows 2000, with a sweeping set of capabilities and a reengineered core that will usher in a new era of 64-bit server computing. Like its Windows Vista stable mate, Windows Server 2008 was in development an achingly long time, and some of its many features were originally slated for its predecessors, Windows Server 2003 and Windows Server 2003 R2. Unlike Vista, however, this lengthy schedule hasn't proven problematic. In fact, it's arguably worked to the product's advantage: This is a refined, mature, and stable operating system that will no doubt power server systems of all kinds for years to come.
by Anuj-Sharma(System Administrator)
http://www.winservers.co.in/