Windows Vista build 5270

This build marks the official Beta 2 of Windows Vista and was the backbone of the December 2005 CTP (though build 5259 was demonstrated too).

This build renamed Windows Antispyware to Windows Defender and had minor UI changes.

This build is the last build to include the 'Professional Standard (N)' and the 'Professional Enterprise' SKUs. They were replaced by build 5308 with the 'Business (N)' and the 'Enterprise' SKUs respectively.