"consider the value of creating a mixed estate of Windows, Linux and possibly even Mac"

you havin' a laugh ... or do you just like spending all month delivering patches and updates?

Most apps don't run on linux (without some sort of emulation / wine affiar) ... so for the sake of £90 .. I'll spend the cash rather than have all the wasted man hours with hundreds of patches, user training sessions, new standard builds, admin security courses, test environments (as the mac is so good at updates not breaking things) etc. etc. ... ... ...