Windows server 2008 has more superiority than Windows server 2003, even though it also has the resize partition function, most people still search partition magic 2008 in order to finish the hard-realize partition operations such as do server 2008 extend boot volume to optimize the computer performance as the built-in resizer has limitation on Windows server 2008.
As one of partition magic 2008 tools, server partition manager supports more advanced features in many disk management fields than the Windows built-in. It is the multi-lateral-win software designed for Windows server OSs, Win7/Vista even with its enhanced data protection as the partition magic server, partition magic server 2003, partition magic Vista, partition magic Windows 7.
Launch the Partition Assistant Server Edition, two choices about "Extend Partition" and "Partition Assistant" as follows:

Choose "Partition Assistant" for instance, as the following screenshot, and there is unallocated space follow the selected C: drive (condition) in blue, drag to the right by the circled two-way arrow below:

Extend other partition: In fact, extend other partition through partition magic 2008 all operated by the same way as introduced above. But we need to note that there must be has unallocated space follow the target extend-partition, if not, take an eye on create the unallocated space as following steps:
Here extends D: partition, but there is no unallocated space behind D: for it as shown below:

Unallocated space is created after the E: is dragged to rightward, then you can extend D: partition into the near unallocated space:

Many users consider resize windows server 2008 partition as headache, for it can not be realized perfectly by server 2008 disk management. So, for this problem, actually, through the procedures above, it is not a problem any more, right? Just turn to this partition magic 2008 software—Partition Assistant Server Edition for friendly help, work like a charm.
For enterprise users, Partition Assistant Unlimited Edition is a better choice to support the unlimited usage within one company. Also, you can use Technician Edition to provide charged technical services to your clients. You could choose different edition based on your needs.
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