Microsoft has posted both x86 and 64 bit Editions of the build that was handed out to attendees of the Professional Developers Conference to Microsoft Connect, the beta site for Windows Vista.

According to our source, this test build does not feature the sidebar or IE quick-tabs that have been demonstrated at the PDC. It does however include Tablet and Media Center functionality.

The Pre-Beta 2 x86/32 build is a DVD image just over 2.8 GB in size and carries the label vista_usa_5219.050830-2010_x86fre_win-dvd.iso, slightly different than the demo build.