I was discussing this topic with one of my colleagues the other day. The size of the market opportunity matters. For example, we sell Linux-based mailing solutions. That is a tenth of the spend that companies do on Exchange and Notes. So, the question is: how can we target those users?
How we define the market opportunity will either embolden us or constrain us.
In most early stage companies, the discussion of market size never comes up because there is little or no revenue. Once the revenues start coming in, then one needs to start thinking of the future – and how the market opportunity can be expanded.