
"(We) have recently learned that our technologies are not currently included in the Windows 8 operating system under development. If our technologies are not included in the commercial version of Windows 8, we expect to support DVD playback functionality by increasingly licensing our technologies directly to OEMs and ISVs, and we will seek to extend our technologies to further support online content playback," read Dolby's statement.
Microsoft did not give a public reason for ditching Dolby, but it appears that adding the tech was no longer a selling point so saving the money seemed prudent.
Many PC makers license the tech directly, regardless.