A Power Pack is an update that adds new features and provides fixes for known issues to improve how you protect, connect and share your files and digital content. Windows Home Server Power Pack 1 and Power Pack 2 will automatically install as part of Windows Update if Automatic Updates is enabled on the home server.  How to turn on automatic updates
Currently in beta testing, Windows Home Server Power Pack 3 improves the Windows Home Server experience with Windows 7 and Windows Media Center by providing the following features: Backup and restore of computers running Windows 7, Windows 7 Libraries integration, enhancements for Windows Media Center, and better support for netbook computers. Windows Home Server and Windows 7 -
Great Together .
Windows Home Server Power Pack 2 adds new features and fixes known issues to improve the Windows Home Server experience. Enhancements include: Improvements to remote access configuration, enhanced media server functionality for computers running Windows Media Center, and content streaming support for Windows Media Center Extenders. Overview of enhancements: The Remote Access Settings page is redesigned to make it easier to use. A Web-hosted diagnostic service is used to more accurately test if remote connectivity is available from outside the home network. New and improved initial configuration and repair wizards, as well as better troubleshooting guidance for common home networking issues that can prevent Remote Access from working properly.
 Windows Home Server Console - Remote access settings  Windows Home Server Console - Configuring remote access  Windows Home Server Console - Remote access settings When the Windows Home Server Connector software is installed or updated on a Windows Media Center computer, the next time a user starts Windows Media Center they will be prompted to install the Windows Media Center Connector. This makes it easy to turn your home server into a media server. Windows Media Center computers will automatically have access to content stored in shared folders on the home server. Music, Photos, Videos, and Recorded TV folders are enabled by default. Windows Media Center Extenders can access and stream multimedia content stored on the home server. Access permission can be granted on an individual folder basis. Windows Home Server now supports streaming MP4 files, a popular format for high quality multimedia, to Xbox 360 and other devices that support the MP4 format. Metadata such as title, artist, composer, album, and genre now appears in the music or video library.
 Windows Media Center - WMC Connector installation reminder  Windows Media Center Connector - Installation wizard  Windows Media Center Connector - Installation wizard  Windows Home Server Console - Configuring Windows Media Center Extender access  Windows Media Center - Videos folder on Windows Home Server Windows Home Server Power Pack 1 fixes known issues and adds new features to make the Windows Home Server easier to use, faster, and more reliable. Overview of enhancements: View thumbnails of your photos when accessing them remotely Drag and drop multiple files to upload from Internet Explorer 6 and 7 Allow remote access to specific folders depending on the user
Compatible with home computers running Windows Vista 64-bit editions Back up and restore shared folders to an external hard drive Automatically wake home computers from standby for energy efficient backups
Improved file transfer performance when using multiple hard drives Health monitoring of all files stored in shared folders Processor power management is enabled using the Server Balanced Process Power and Performance power scheme as the default setting
For additional information, please read the Power Pack Release Documentation | 
