The service pack brings a number of changes and bug fixes to Windows Vista. It provides support for VIA's new 64-bit CPU, Bluetooth v2.1, Windows Connect Now (WCN) Wi-Fi Configuration wireless functionality, faster Wi-Fi resume times after hibernation, and most significantly the ability to record Blu-ray.

It also features a number of software/connectivity improvements, including faster RSS feeds in the sidebar, Windows Search 4.0, the ability to configure the maximum number of TCP connections.

The service pack is also for Windows Server 2008, and offers the Hyper-V virtualization environment as a free fully integrated feature, with one free daughter OS with Windows Server 2008 Standard, four free licenses with Windows Server 2008 Enterprise, and an unlimited number of free licenses with Windows Server 2008 Datacenter. It also improves the management options in Windows Server 2008 and fixes some licensing key problems.

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