Your hotmail will open, instead of your POP3 account, because you need to specify there, what programs you want it to open when you click on it. Or else, only your hotmail will show up
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See this screenshot. If you want internet explorer to open, type iexplore.exe in this space and internet explorer will open when you click on it next time...
If you want outlook to open, just type the exe file for outlook and it should open when you click it (I forgot whats for outlook, sori...)...
EDIT: np inc_haydn...