[Blind-sysadmins] Exchange on Virtual Server

I wonder if some kind soul can advise here please? With Microsoft Action Pack, you only get one Server 2016 Standard license, which we have installed as a Domain Controller. Action Pack also comes with Exchange Server 2016. You are advised against running Exchange 2016 on a DC, but purchasing a second server with Server 2016 for 2-3 users is overkill and expensive. It has been suggested that we install a Virtual Server on the DC to run Exchange, but the question we are having difficulty getting an answer to, is whether or not it is both possible and legal to use the same Server License on the same hardware? Has anyone got a definitive answer? George