According to the article Parallels Server will soon be released:
Parallels Server will allow disparate operating systems to run on the same server. While large companies tend to have the power to force standardization on a single operating system, making Virtuozzo’s virtual environment approach appropriate for them, SMEs need the flexibility that true virtualization offers, according to Benjamin Rudolph, director of corporate communications at SWsoft.
Some of the features of Parallels Server, such as full 64-bit support for host and guest operating systems, and support for multiprocessor VMs, should also appear in the next major version of the desktop edition, due in the first half of next year
Besides, some of these features will also be included in Parallels Desktop major version that is being developed now.

