The public beta of Service Pack 1 for Windows 7 & Windows Server 2008 R2 will be released by the end of July. Service Pack 1 will be a joint release for both Windows Server 2008 R2 and Windows 7. There are not feature changes to Windows 7, however for the Server, there are two important new features around virtualization.

Dynamic Memory – an enhancement to Hyper-V in R2 that allows administrators to pool all the memory available on a physical host and dynamically distribute it to VMs running on that host as needed. VMs will be able to receive new memory allocations without a service interruption based on workloads. Check out the Virtualization Team Blog for more info on Dynamic Memory here: http://blogs.technet.com/virtualization/archive/2010/03/18/Dynamic-Memory-Coming-to-Hyper-V.aspx

RemoteFX enhances the desktop virtualization stack. IT will be able to deliver a richer and desktop virtualization experience to end users. RemoteFX which functions independently of any graphics stack supports any screen content including Silverlight and Adobe Flash. It enhances the end user hardware experience with support for USB redirection. RemoteFX works on a wide target of devices so you can deploy it to both thick and thin clients and a variety of network configurations. Check out the Virtualization Team blog for details here: http://blogs.technet.com/virtualization/archive/2010/03/18/Explaining-Microsoft-RemoteFX.aspx