Linux business software
Some of the pro-Windows posts (Chris C's is a good example) seem to be suffering from the same delusion that most people in charge of IT purchasing decisions seem to be suffering from: that business software that runs on an open source operating system must necessarily also be open source, and that all proprietary software must necessarily be Windows only.
This is simply not the case. Microsoft's software tends to be Windows only, but consider Domino, Oracle, Sybase Adaptive Server and hundreds of other proprietary products that can be run on Linux systems. Businesses have been locked into Windows because they have standardised on MS Office and, more seriously, because they have written in-house software using Microsoft technologies like VB.
Some things are really a pain to port, but others are not so bad. Sybase Adaptive Server is a huge improvement over MS SQL Server for example, and porting the SQL side of a client/server application from MS SQL (a bastardised SAS anyway) to SAS is, while not trivial, perfectly doable and quite worthwhile.
Companies that lie down and accept that they're tied to this expensive and defective platform remind me of the sort of people who borrow money to cover debt payments. Rather than accepting that they need to take a little pain just now for the sake of the future, they prefer to list the problems and then stare at you blankly (or worse, smugly) as if those are brick walls, not mere challenges.
Ah, there's no convincing some people. They'd rather bury their heads in the sand and say clever-sounding things about ROI and TCO based on a few duff studies funded by software vendors.
Hey, never mind. Darwinism will sort this out. If, as I firmly believe, it is a genuine advantage (no pun intended) for businesses to run FOSS, the bottom line will reflect it eventually. Of course there are lots of other factors, but if businesses that use Linux are systematically better off than those who use Windows, it's only a matter of time.
Incidentally, FOSS tends to sneak in through the back door anyway because the loudmouthed, self-satisfied naysayers are not bright enough to realise the number of devices and appliances that have Linux kernels in them. I work for a "Windows shop" which at this point uses hundreds of Linux devices, largely because nobody mentioned they used Linux during the purchasing process. Soon enough, the powers that be will have to admit that they need some Linux people, and then the TCO claptrap will go out the window finally and maybe I'll see some Linux servers appear.