I have one (but only one) Hyper-V VM which has the "mouse not captured in remote desktop session" issue. I have researched this problem extensively and so far none of the suggested fixes I have found are working.
The VM is running Windows Server 2012. It is completely up-to-date.
The Hyper-V server its running on is running Windows Server 2012 R2. Also up-to-date.
All integration services are offered in the VM according to the Hyper-V management tool. I have tried removing all integration services from the VM and putting them back with the Hyper-V management tool. This had no effect.
I have also set the VM to "Detect HAL" using BCDEdit... this had no effect.
The only suggestion I could not try is the suggestion to use the "Insert Integration Services Setup Disk..." command from the "Action" menu. I can not do this because a message to "Tap to choose what happens with this device" message pops up when I try it... and, guess what? I can't "tap" it because like everyone else we don't use touch screens in the server room. I can't click it either because my mouse doesn't work. Trying to click it just brings up the same "mouse not captured in remote desktop session" message I am trying to get rid of.
Any suggestions?