Microsoft late Friday delivered the first build of Windows Vista to follow the release of Beta 2 at WinHEC in May. Build 5456 is available to technical beta testers, and includes better user interface performance along with User Account Control tweaks to lessen the number of authentication notices.
UAC is designed to keep applications running in a reduced privilege mode, so malicious programs cannot do extensive damage to the operating system. However, many Vista beta users have found the feature frustrating, as seemingly basic operations require multiple confirmations. Microsoft will not make interim Vista beta builds available to Customer Preview Program customers, who must wait until RC1 for a new release.
Beta 2 Released