With Windows Vista, third party Partition application like Partition Magic, Disk Director or any other Partition Manager is no more required because Windows Vista itself is equipped with their in-house partition manager.

This vista partition application is easy to use which it allow to shrink and extending existing partition like other popular partition program. Below is the simple step to shrink and extend vista partition
Shrinking Windows Vista Partitions or partitioning:

1. Start Menu -> Control Panel -> System and Maintenance -> Administrative Tools -> Double Click Computer Management -> Storage -> Disk Management.
2. Right click on vista disk partition that you want to shrink and select the shrink option.
3. Then , A pop-up box will be appear and you need to enter the amount of space you want to shrink the partition by (By default, the maximum is entered).
4. Click Shrink and Vista partition application will start to shrink the disk according the amount that you enter.
5. After shrink the partition, You can click the new partition and format it the way you want it.

Extending Windows Vista Partitions:

1. Start Menu -> Control Panel -> System and Maintenance -> Administrative Tools -> Double Click Computer Management -> Storage -> Disk Management.
2. Right click on vista disk partition that you want to extend and select the extend option.
3. Then click Next in the Extend Volume Wizard.
4. Then Vista extend volume wizard will list down all the free space available on the disk drive and let you extend on the particular disk partition.
5. Select the amount of disk space available that you want to extend in on the particular partition.
6. Click Next and Confirm and Finish. That’s it! You have extended the partition.