It will probably take quite some time before we switch from Win 8.1 to 10. I see no immediate advantages. Even so, I have installed it on a lab PC and tested a little bit. If nothing else, since we do a lot of conference productions, we must be able to help our customers when they can't get their laptops connected to the projector, change display settings, connect to internet, etc.
So far vMix 15.0.0.88 for sure works on W10, but I also found some issues.
It seems that Quicktime is not available for W10, Apple says "QuickTime 7.7.7 for Windows Vista or Windows 7".
Not sure what that means for vMix and the use of Quicktime dependent videos.
There is no smooth way to turn off automatic updates in W10. We do this in W8.1 to make sure nothing is downloaded while we need the available bandwidth for streaming. Even more important, not have a sudden reboot during production. Although there are some workaround (eg see
Wired's and
Gizmodo's solutions, it's kind of messy. My guess Microsoft will change it's policy and enable disabling - so to speak ;)
Multiple desktops and desktop capture, it works - but I have only tested it on the local PC. One must select "Capture hidden window" if the thing you want to capture is running on another desktop than the one vMix is running on.
On a side note, we have the W10 "feature" Wi-Fi Sense, that shares the SSID and passwords you have with your "social friends". Something you might not want to do, and seems to be enabled by default if you install W10 with "Express settings". Google it, or see for example
ExtremeTech, for more info.