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I have One Immutable VHD and have created two new machines from it with differencing disks.

As these diska have grown beyond resonable size I'd like to merge them and use them as individual disks.

How can I merge both differencing disks with base image as base image is immutable and get two machines?

MY disk layout now :

VHD1 (immutable)
|
|____Server1 (differencing disk 1)
|
|____Server2 (differencing disk 2)

and would like to get two individual disks.

If you clone one of the child disks with "VBoxManage clonehd" you should get a single, "flat" clone.

Details on how to use "VBoxManage clonehd" to do what you need: http://forums.virtualbox.org/viewtopic.php?f=1&t=33528