Hi there, can someone help me please?

I have just installed microsoft outlook on my machine, was previously using outlook express for emails, the only problem i am having is that i am not receiving emails in outlook but they are still going through to outlook express. i cant find out what is wrong, i have checked my P0P3 setting, this is exactly the same! It has also been set as default email programme.
Is there anything else i need to do?
Do i need to remove outlook express for this to work properly?