If you are using Hyper-V on computers on which you want to install this service pack, you should be aware of the following considerations:

• You can import and export virtual machines freely between virtualization servers running Windows Server 2008 R2 and Windows Server 2008 R2 with SP1 as long as neither Microsoft RemoteFX nor Dynamic Memory are enabled on the virtual machine
• Virtual machines running Windows as a guest operating system that have R2 integration services installed will run normally on virtualization servers that are running Windows Server 2008 R2 with SP1. The Dynamic Memory and RemoteFX features, however, require the SP1 version of integration services, which includes other updates and enhancements as well. To get the SP1 version of these services, either install SP1 on the guest operating system or user Hyper-V Manager (see http://technet.microsoft.com/en-us/library/cc732470(WS.10).aspx for details).
• Once you have installed this service pack, you will have to uninstall it prior to installing a later release of this service pack. The settings of any virtual machines will remain intact during the uninstallation and installation, but virtual machines that have RemoteFX or Dynamic Memory enabled will not appear in Hyper-V Manager while the service pack is removed. In addition, any snapshots taken when RemoteFX of Dynamic Memory was enabled will not appear in Hyper-V Manager. They will reappear and functional normally once the later release of SP1 is installed.

A Windows Server 2008 R2 Hyper-V Cluster can run as a mixed cluster of nodes running Windows Server 2008 R2 and Windows Server 2008 R2 with SP1. For information about installing a service pack in a cluster, see http://support.microsoft.com/kb/174799/en-us. Before you install the service pack on a cluster, you should be aware of the following considerations:

• Do not enable either RemoteFX or Dynamic Memory until the entire cluster is upgraded to Windows Server 2008 R2 with SP1.
• Migration of virtual machines that have Dynamic Memory enabled to a node that does not have Dynamic Memory support will fail
• Migration of virtual machines that have RemoteFX enabled to a node that does not have RemoteFX enabled will fail.
  To live-migrate virtual machines that have RemoteFX enabled, all nodes must be capable of supporting RemoteFX, all nodes must use identical graphics processing units, and all nodes must have RemoteFX enabled. For details of the CPU requirements for RemoteFX, see see “Hardware Considerations for RemoteFX” at http://technet.microsoft.com/en-us/library/ff817602(WS.10).aspx

http://microsoftfeed.com/2010/nec-express5800r320-servers-bring-fault-tolerance-to-microsoft-hyper-v-environments/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+microsoft_feed+%28MicrosoftFeed%29

Copied from http://blogs.technet.com/b/storageserver/archive/2010/11/16/windows-storage-server-2008-r2-references.aspx

Windows Storage Server 2008 R2
Microsoft.com:  http://www.microsoft.com/windowsserver2008/en/us/wss08.aspx
TechNet Overview: http://technet.microsoft.com/en-us/library/gg232660(WS.10).aspx
Getting Started Guide: http://technet.microsoft.com/en-us/library/gg214166(WS.10).aspx
Known Issues List: http://technet.microsoft.com/en-us/library/gg214171(WS.10).aspx
OEM Deployment Guide: Download the guide here.
OEM Partners: http://www.microsoft.com/windowsserver2008/en/us/wss08/partners.aspx

Find out more about Specialized Server Solutions and how to become an OEM Partner.

Downloads:
MSDN and TechNet Download: http://msdn.microsoft.com/en-us/subscriptions/downloads/default.aspx?pv=18:370
Embedded OEM Trial Software:  The Embedded Server Evaluation Website now has the Windows Storage Server evaluation package available for IHVs, OEMs, ISVs, consultants and VARs to evaluate and test the product. The download is available after a quick registration page.

Windows Server 2008 R2
New Technology: http://www.microsoft.com/windowsserver2008/en/us/whats-new.aspx
New in Windows File Services: http://www.microsoft.com/storage

Storage Technology Facts
Default cluster size for NTFS, FAT, and exFAT (256 TB NTFS limit) - http://support.microsoft.com/kb/140365
Large Logical Unit Support and Windows Server 2003 SP1 (GPT): http://www.microsoft.com/whdc/device/storage/LUN_SP1.mspx and http://www.microsoft.com/whdc/device/storage/GPT_FAQ.mspx
How NTFS works (256 TB limit) : http://technet.microsoft.com/en-us/library/cc781134.aspx
Reviewing Storage Limits: http://technet.microsoft.com/en-us/library/cc773268.aspx
Microsoft Storage: Fact and Fiction - http://www.microsoft.com/windowsserversystem/storage/getstorfacts.mspx
How to calculate the LUN limit per HBA - http://blogs.technet.com/b/filecab/archive/2008/10/20/storage-tip-how-to-calculate-windows-server-2008-lun-limit-per-hba.aspx
How dynamic disks and volumes work - http://technet.microsoft.com/en-us/library/cc758035.aspx
How basic disks and volumes work - http://technet.microsoft.com/en-us/library/cc739412.aspx

Windows Storage Server Whitepapers
Windows Server 2008 R2 Whitepapers
Improve your understanding and get more in-depth information about Windows Server 2008 R2 in these whitepapers: http://www.microsoft.com/windowsserver2008/en/us/white-papers.aspx

Performance Tuning Guidelines
This guide describes important tuning parameters and settings that you can adjust to improve the performance and energy efficiency of the Windows Server 2008 R2 operating system. This guide describes each setting and its potential effect to help you make an informed decision about its relevance to your system, workload, and performance goals.  http://www.microsoft.com/whdc/system/sysperf/Perf_tun_srv-R2.mspx

NFS Account Mapping Whitepaper
This paper covers Network File System (NFS) account mapping and the deployment in Windows Server 2008 R2. NFS is a network file sharing protocol that allows remote access to files over a network. NFS implementations include an NFS server component, which enables the sharing of files for use by other networked computers, and an NFS client component, which enables computers to access files shared by NFS servers. The Services for NFS role service in Windows Server provides the ability to function as an NFS server. Windows and UNIX operating systems use different account and security systems. Windows operating systems represent users and groups with a unique security identifier (SID), while UNIX operating systems represent users with user identifiers (UIDs) and group identifiers (GIDs). Account mapping is the process of correlating the UNIX UIDs and GIDs to corresponding Windows user and group SIDs.
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=5f4c294c-8692-4235-8236-8ea809ae71f7

Operational TCO Comparison:
Windows Server 2008 File Services vs. Dedicated Storage System Vendors  (Done by the Edison Group)
http://www.microsoft.com/windowsserversystem/solutions/specializedservers/product_guide/product_guide/content/03.wp.print.htm

Other Windows Storage Server Blog Entries

1. MSDN release information
2. iSCSI PowerShell cmdlets
3. How to create differencing VHDs for iSCSI boot using WMI.

Finally Outlook 2007 now supports Exchange 2010 personal archives, you need to install an update that is now available in December 2010 Cumulative Update for Office 2007

You can read more details at http://msexchangeteam.com/archive/2010/12/20/457238.aspx

Enjoy!

If you're protecting encrypted files using System Center Data Protection Manager  then you'll want to check this one out http://support.microsoft.com/default.aspx?scid=kb;EN-US;2476276

Enjoy!