http://technet.microsoft.com/en-us/evalcenter/ff183870.aspx 

Je vous invite à la tester et à découvrir toutes ses nouveautés, parmi lesquelles :

Changes specific to Windows Server 2008 R2

Dynamic Memory

Microsoft RemoteFX

Enhancements to scalability and high availability when using DirectAccess

Support for Managed Service Accounts (MSAs) in secure branch office scenarios

Support for increased volume of authentication traffic on domain controllers connected to high-latency networks

Enhancements to Failover Clustering with Storage

Changes specific to Windows 7

Improved HDMI audio device performance

Additional support for communication with third-party federation services

Change to behavior of “Restore previous folders at logon” functionality

Enhanced support for additional identities in RRAS and IPsec

Support for Advanced Vector Extensions (AVX)

……