Everything is horribly out of date here. I took over in 2018 and have been trying to upgrade us since. The old headmaster was against technology everything was paper based. up to 2016 I believe! So computer and OS purchases have been through the likes of ebuyer. we have had the same MS 2007 for years. When i purchased a new server in 2019 We bought individual licenses user cals, core cals e.t.c as needed through the supplier. I think we have had the A1 Pro Plus 365 for a while though which is free.
I don't fully understand what I have been quoted, I understood it would cover us for Windows 10 upgrades, windows server licensing and allow us to use 365 on school computers. He suggested that it is activated upon logging in.