Different with resizing partitions one by one - shrink a data partition to get free unallocated space and then extend C drive, this video shows easier way to resize SBS 2011 partitions.
To extend system C: drive, right click any data partition and select "Allocate Free Space" feature, in the pop up window, input the value how much free space to rob from this partition, and then add the free space to C: drive.
If you want to extend C: drive by taking space from two or more partitions at the same time, please refer "Extend Partition Wizard" feature.
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