Re: Cost is the smaller concern
The local school district recently switch over to an all Linux environment. The results have been a disaster. Week long outages of mail systems. Total lock out of the teachers from being able to use the software on multiple occasions. Rooms full of PCs that nobody can fix.
Open Source software is not free. It costs time and money and requires REAL skill to work with. I hope someone is recording all the hours spent making things work, because the total is going to be staggering.