Linux is getting a lot of attention in the corporate world now. Lotus has a Domino server for Linux (and I've got the beta). Citrix, Real, Adobe and others have supported this platform for years. Good to see.
Is Microsoft fighting a losing battle? Will it continue to distance itself from all things Open Source? Dunno... Office runs on Macs now and there was a time I never thought I'd see that happen. MS could, if it wanted, port some apps over and distribute them Object Code Only (OCO), and only need to arrange licensing with the folks who make KDE and Gnome... but to the detriment of their own desktop. Perhaps write their own Display Manager to emulate the Windows desktop, which no self-respecting Linux user would ever install... and DON'T bother porting IE. ;-)
Hey, MS can have the desktop; There's lots more to it than that. I just don't think there's much of a market for MS products on Linux.