We were invited to use a Linux server solution and did so with mixed sucess for 3 years before jumping back to Windows platform. We had a very hybrid system with a Linux server some linux thin and medium client and windows 98 and XP.
Pupils used OO and MSO and moved almost seamlessly between the two,Staff were another matter with resistance to all computers let alone something that was 'different'. The lack of a relational database led us away from OO and the proponderance of teaching material based on MSO 2000 mkes using it for teaching a much simpler option. As a small school relying on remote support for maintaining our Linux server that found coping with increasing numbers of XP workstations we felt that a Windows platform was the best choice for us. Particularly as we wanted to run educational software across the network, Maths Alive, Metro Electro etc
That said 3 years ago Windows licences were £100+ and offices licences a simmilar ammount, both of these are now below £35 each following increasing interest in non MS products. I have no regrets about becomming involved in Linux and OSS and there are many interesting developments out there but some of the 'anoraks' involved in OSS must remember that ICT is a tool for learning in schools and ICT Technicians and co-ordinators have a responsibility for their systems to be reliable nd useable; for us Windows platform was the way to move.
Without some real enthusiasts and support from colleagues in school OSS will struggle to work for the pupils and school in general, If it can be embraced by the whole school then all well and good but in the majority of establishments it is for the hidden processes, proxy servers, cacheing and servers provided that you have local expertise, or not at all.
I have yet to read the PC pro article, I don't have the time, it is on the side in the kitchen but will do so, having read the threads above OSS and Microsoft have their supporters, I have a lot of time for the OSS movement and the pressure they put on Microsoft but for the moment I am with Microsoft but that will be reviewed next time we are in need of a major overhaul, for the moment I broadly agree with PC Pro, Linux isnt for front end users in schools.