When files and data are full on server partitions, low disk space of system partition becomes a big problem of running windows server 2008. On the other hand, while primary partition is almost full, logical partitions are still free with disk space. Thus, many windows server 2008 users tried different ways to solve this problem. And to extend volume server 2008 is one of good solutions.
For experimental users, diskpart command-line is a good choice; but for common users it is not. So, a third party disk utility is better for them. Among many excellent partition software, Partition Magic, Partition Assistant, etc is always highly recommended. While partition magic is no longer designed server edition, its alternative Partition Assistant Server can provide safety and convenient help.
server partition manager is a safety and convenient solution to extend volume server 2008 and reliable disk management toolkit, minimizing server downtime to increase the performance of Windows server 2008.
Partition Assistant Server contains powerful partition manager and convenient extend partition wizard, which could help you extend system partition or other partitions on windows server 2008.
Open Partition Assistant Server, choose the second option to open its Main Windows:

Right click on the partition you want to extend, choose "Resize":

Specify the size you want to allocate, click "Ok":

Click "Apply" to take all the operation effect:

Now, do extend Volume Server 2008 and see how amazing the partition manager! Download to try.
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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