I'm probably going to be putting one in on a PC for a client that I should be running away from. Running fast and far.
The thought of trying to run cable in this building gives me the heebie-jeebies, the client is cheap (not broke, but not swimming in $$ or even $), the current cable is almost certainly Cat3 but it suffices for the half-duplex 10baseT that was connected to a hub (not switch, not switching hub, hub), and the current PC is running Windows 98 with a 13" CRT. It's also stapled along the baseboards as it runs from the back area up to the front of the office, going up and over a couple of doors on the way.
Got a new PC, monitor, printer for them because they were going to switch to a cloud-based Practice Management system; got up there last week and found that A) Those plans got cancelled (their billing service said "we can convert those codes before passing your bills to insurance") and B) They're sticking with their existing Medisoft, running on Win98 via a shared directory (one PC is the server where that lives, the other runs the DOS-mode executables from that network share).
I suspect I'll end up letting them run Windows 98 and their software in VMs in VirtualBox, but I haven't tracked down install media yet. I also haven't checked whether the printer we got for them actually supports PCL which I suspect may be needed for printing.
That or I'll run.