Microsoft (MSFT -2.3%) heads south as a harsh Barron's column is followed up by a flurry of media articles related to Windows 8, some of them critical. The NY Times becomes the latest to observe many early Windows 8 users have become confused by its radical, tile-based UI. Reuters, meanwhile, joins others in noting early corporate interest in Windows 8 is limited. Gartner predicts Windows 8's PC penetration within large organizations will only reach 20% at its peak. A shift towards subscription-based licensing could buffer Microsoft a bit.