A computing system may include first and second client computing devices each configured to generate a respective local graphics surface. A virtualization server may be configured to run a virtual collaboration application for the first client computing device hosted in a virtual computing session, and to generate a virtual graphics surface from the local graphics surface of the first client computing device within the virtual computing session. A collaboration cloud computing service may cooperate with the second client computing device and the virtual collaboration application at the virtualization server to share the virtual graphics surface within the local graphics surface of the second client computing device.