In general the market for security professionals is bigger and more robust than that for Lotus notes (both in terms of market size and in terms of opportunity and growth possibilities). That said, a lot will depend on where you live and what the local opportunities are like. If you don't have a strong preference and are looking for the path with the longest lifespan or best career opportunities, security is the way to go. But if you prefer doing messaging stuff to doing security stuff (and there is some overlap between the two areas to consider as well) then it might still make more sense to go the Lotus Notes route rather than the security route.
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