After Longhorn was named Windows Vista in July 2005, an unprecedented
beta-testprogram was started, involving hundreds of thousands of volunteers and
companies. In September of that year, Microsoft started releasing
regular
Community Technology Previews (CTP) to beta testers. The first of these was distributed at the 2005 Microsoft
Professional Developers Conference, and was subsequently released to beta testers and
Microsoft Developer Networksubscribers. The builds that followed incorporated most of the planned
features for the final product, as well as a number of changes to the
user interface, based largely on feedback from beta testers. Windows
Vista was deemed feature-complete with the release of the "February
CTP", released on February 22, 2006, and much of the remainder of work
between that build and the final release of the product focused on
stability, performance, application and driver compatibility, and
documentation. Beta 2, released in late May, was the first build to be
made available to the general public through Microsoft's Customer
Preview Program. It was downloaded by over five million people. Two
release candidates followed in September and October, both of which
were made available to a large number of users
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