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Without knowing exactly what you have in mind when you say "slow down" it's hard to give a good answer. Every program/processVisiteHere: https://msgroup.blog/ slows a computer to some extent, so in the simplest of terms the answer is "yes". I suspect what you are asking though is "does Outlook cause a significant slow down in a computer". If that's the case, then the answer is "no" assuming of course that everything is operating properly. Like any program Outlook can cause problem