Starting with Virtuozzo 6.0 Update 9, Virtuozzo (formerly Parallels Cloud Server) has been approved for Windows Server Virtualization Validation Program (SVVP) certification for virtual machines based on Windows 2012 R2 operating system*.
The approved certification provides the opportunity to receive support from Microsoft at the same level as owners of physical servers and Hyper-V virtual machines do.
More details on the program can be found in the following article:
Windows Server Virtualization Validation Program
The certification report for Virtuozzo can be found here:
Windows hardware certification report
*Products that have passed the SVVP requirements for Windows Server 2012 R2 are considered supported on Windows Server 2012, Windows Server 2008 R2, Windows Server 2008, and Windows Server 2003 SP2 and later Service Packs, both x86 and x64.