VMS also ran on Dec-Alpha. The main problem was that a single Alpha could replace an awful lot of VAX HW and so to claw the profit back, the license fees meant

VMS also ran on Dec-Alpha. The main problem was that a single Alpha could replace an awful lot of VAX HW and so to claw the profit back, the license fees meant a VMS Alpha was about 3x the price of the same machine running NT. We used to buy NT Alphas and install Linux - to compete with Sun Sparcs.