I have Exchange EDGE ROLE installed as VM on Hyper-v (Win 2016 std).
When DPM 2016 tries to backup that VM I have an error that it is failing, I tracked the problem to inability to make VSS snapshot because ADAM (MSExchange) Writer is failing with state 11. (DPM trigers Hyperv checkpoint on vm host, which trigers VSS shapshot on guest OS, which uses VSS writers)
Does anybody had similar problem, there is not much info if you Google it, only about registry key missing, thath I have checkeh and it is ok on my instalation.