Windows Server 8 build 7959 has leaked. This appears to be the first build from Milestone 3 that the public has got its hands on, although it is said to be quite buggy, according to BetaArchive. As always, we must emphasize that this is still very early in Windows 8's development, so try not to start forming your opinion on the OS just yet.

At the time of writing, build 7959 was made available on private FTP sites but at the time of publishing it should be arrive on the usual torrent and file sharing sites. It's also worth noting that build 7959 is a 64-bit server version of Windows 8, and not a client version like the builds that have leaked in the past.

Criminals have started using an obscure image filter to make malicious PDF files all but invisible to many antivirus programs, Czech security firm Avast Software said.

The trick involves hiding a common Adobe Reader exploit inside a PDF (Portable Document Format) file by encoding it with the JBIG2Decode filter, normally used to minimize file sizes when embedding monochrome TIFF (Tagged Image File Format) images inside PDFs.

Two weeks since after Sony's PlayStation Network was hacked Kazuo Hirai, chairman of Sony Computer Entertainment, addressed the issue in a press conference in Tokyo tonight.

Though they still don't know who orchestrated the intrusion on the PSN servers in San Diego, Calif., they were "very sophisticated," Hirai said. It's still not entirely clear what kind of data the hackers got their hands on, but he reiterated that they don't believe credit card data to have been taken and added that the company has received no complaints of identity theft or credit card fraud yet.

Security researchers claim to have spotted hackers attempting to sell PlayStation Network user data, presenting perhaps the most worrying installment of the ongoing PSN hack saga.

Kevin Stevens, senior threat researcher at Trend Micro, has been putting the word out, warning the public of the situation. The hackers even claimed that they gave Sony a chance to buy back the info, although Sony itself denied that this has occurred.

Everyone knows that Windows is installed on the vast majority of computers, but it's always interesting to be reminded of what a cash cow the OS has been for Redmond. According to Gartner, Microsoft owned 78.6 percent of the global market revenue share for desktop operating systems at the end of 2010 -- revenue up almost 9 percent from 2009.