There is a new Azure Calculator for Education Pricing coming out at the moment, i think from what ive read/heard/gathered info on and based on our own use of VLSC i understand it that while windows for the most part becomes free due to win10, your main payment will be in O365, the idea being with azure connections in place you would move to SaaS (software as a service) and use remote web apps connections, the issue is i dont think or feel you would yet move fully to cloud based services although a lot can be done! Your higher costs will come with licensing the same old legacy apps that cant be cloud maintained for example SQL based programs etc and so SQL licenses and local Hyper-V licensing is going to hurt after the deadlines pass. I forget the guy that gave a speech about it but its nicknamed SoSaas (Same old software as a service).
Ive seen Sims Clients pushed out by webapp and run well with Solus 3 for example, but the ramifications for putting a whole Sims database/server in the cloud is a bit mind boggling. I certainly also dont trust the new Capita hosted option either. Anyway i digress, im off to meet MS this friday with our reseller to discuss our licensing changes we were already using o365 and were planning to move to office as a service anyway on Win10 Start menus so for us at least its not as scary but there are still too many unknowns!