Product : Microsoft, HyperV/2012R2, Standard
Feature : Memory Page Sharing, Memory, Hypervisor
Content Owner:  Roman Macek
Summary
Yes (Transparent Page Sharing)
Details
vSphere uses several memory techniques: Ballooning, memory compression and transparent page sharing. Last level of managing memory overcommit is hypervisor swapping (not desired).
A good example is a scenario where several virtual machines are running instances of the same guest operating system, have the same applications or components loaded, or contain common data. In such cases, a host uses a proprietary transparent page sharing technique to securely eliminate redundant copies of memory pages. As a result, higher levels of over-commitment can be supported.