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Have yet to see cloud be cost effective
Every time I have done the analysis of cloud vs. on-prem, the cloud has come out more expensive if you already have the infrastructure in place. The math probably works if you are talking about a new email platform but maintenance on the old one, which icludes upgrades, always seems to be a fraction of what the long term cost of cloud would be. The internal cost is very predictable if you have a stable employee population and I have never seen the utilization as being very volatile either. Just not convinced by your arguments based on my experience.