I had a meeting with our HP hardware rep and got some interesting news:
So if you aren't already on or planning on upgrading to Windows 10 soon, you may soon have no choice. I am already seeing loss of driver support for Win 7 with some new hardware...
@KennyG Don't forget that if you upgrade between now and 29th July (i.e. two weeks!) it's free, after that it will be chargeable. We're currently upgrading our machines to Windows 10 for this reason and the reasons you mention.
We've done in-place upgrades on the computers (probably 20-30 CAD machines, and the same non-CAD so far) and it's gone very well with no significant issues, so I'd recommend this route to anyone else.
Good point... if you don't have a formal support agreement with MS. Your "free" upgrade to Win 10 expires the end of July.