Swings and roundabouts
Trouble is, in the NHS, you'll have a lot of "stick-in-the-mud" users who get in a big flap every time something changes.
What you save in Windows licences, you'll have to pay in retraining staff.
Note: this is based off experience from when I had several hospitals as clients... getting calls to attend on-site and "look into an error" that turned out to be a warning stating that the report that was about to run was quite big and take a bit of time... panic that data had been lost because they had switched to a different view mode... that sort of thing