Diversify your data center.

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XenServer sets a new standard for free virtualization, with powerful features such as live motion, centralized multi-node management, and multi-server resource sharing. While basic hypervisors such as VMware ESXi can be obtained for free, they need costly management add-ons to meet real-world needs.

...what company can afford to skip a XenServer in the current economic climate? --Alessandro Pirelli, virtualization.info
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  Features included at no cost Citrix XenServer   VMware ESXi    
  Hypervisor Performance 64-bit   32-bit    
  Max Virtual CPU per guest 8   4    
  Windows and Linux Support   check    
  Support for Shared Storage check   check    
  Live Migration check        
  Centralized Configuration & Management check        
  VM Snapshots check        
  Active Directory Integration check        
  Single Image Repository Support check        
  Update Manager check        
  Support for Maintenance Mode check        
  Local Storage Optimization check        
  Upgrade Path Per server   Per CPU,
Core and/or VM
   
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