VMWare Workstation 6 Beta
VMWare, the company noted for its virtualization products has released VMWare Workstation 6 Beta. In this release, there is support for Windows Vista as a host operating system as well as now for Linux users, 64 bit host support for even better performance.
As of right now, it seems that the Windows client is still supports 32 bit mode and currently do not know if this product will run on Windows Vista 64 bit.
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Homepage: VMWare Beta