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Windows 7 for XP ProfessionalsUpdating Support Skills from XP to Windows 7by Bink.nu's Raymond Comvalius
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The upgrade paths available for Windows Server 2008 shown in the table below:
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
There are a couple of important things to remember here. First, with the exception of Windows Server 2008 for Itanium, the table above applies to both x86 and x64 versions. However, cross-platform upgrades (x86 to x64 or vice-versa) are not supported. It is also not possible to upgrade from a previous version of Windows to Windows Server 2008 Server Core Edition.
With respect to resource limits, there are also some changes to be aware of. Many values that are dynamically configured for 32-bit versions of Windows Server 2008 are set to their maximum values in 64-bit versions since the virtual address range is much larger. The notable exception to this rule is the NonPaged pool which is dependent on the amount of physical RAM installed. The table below outlines the resource limits:
Memory Type
32-bit Windows
64-bit Windows
User mode virtual address space for 32-bit processes
2 GB (up to 3 GB with 4GT RAM tuning)
2 GB (4 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE)
User mode virtual address space for 64-bit processes
N/A
8 TB on x64, 7 TB on IA-64 (2 GB without IMAGE_FILE_LARGE_ADDRESS_AWARE)
Kernel mode virtual address space
2 GB (1 GB to 2 GB with 4GT RAM tuning)
8 TB
Paged Pool
Dynamic - limited by kernel mode virtual address space and physical memory
128 GB
NonPaged pool
75% of RAM up to a maximum of 128GB
System cache virtual address space
1 TB
Desktop Heap
3 MB for interactive desktop by default, however this is a tunable value
20 MB for interactive desktop by default, again this value is tunable
System Page Table Entries
Maximum registry hive size
2 GB*
* - the maximum registry hive size excludes the System hive. The System hive size is determined as follows:
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