It says Linux, but it also says IIS-6...?
Makes you wonder if they're not 'just' misrepresenting the ID's pretending to run microsoft software, but missing one of them.
It can be a lot more secure for a webserver to pretend to be a competing product, or something unknown/really obscure -- that way many of the scriptkiddie hacking tools will run the wrong (=harmless) cracks against the server, failing in the process. But somehow I seriously doubt that they would even pretend to have a Linux server, since their corporate policy appears to be denying that Linux even *exists*, let alone that it could be better than MS software in some areas)