I read somewhere that i can have a Win2008 Host Server running AD,DNS and DC services + I can add a Virtual machine on the same server running Linux for setting up a File Server.

Win2008 Standard has limitations for POSE and VOSE??? I think its 1 PoSe and 1 VoSe

Can i still run 1 POSE and 1 Virtual Linux and 1 Virtual VOSE(in case i need to add a role)

I have done this. Try VirtualBox, and install something like CentOS 6.6 or 7.1.

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