This may fly in a GP surgery, how would it work in a large acute?
1. If running VDI you will still need Microsoft licences for the virtual desktops and SQL cals.
2. A lot of vendors, especially those peddling pathology systems are never going to warrant running their system on a Linux distro.
3. Where will I get IT staff with Linux skills and where is the money coming from to train my existing staff?
Surely you need to start at the back end by ensuring vendors don't force you to run MS SQL or Oracle.