Avast compatability with Norton?

I had been using the Norton Anti-virus software on my computer and decided to change to Avast! I downloaded and activated Avast! and things seemed to be going great when suddenly all of my e-mail files disappeared! Everything was gone!! Never to be seen again! I was told that this was because of an incompatability between Avast! and Norton, and that I should have removed Norton from my system before activating Avast. Is this true?

I now have only Avast! on my computer and have no problem, and have suggested it to a friend. Should I advise him to remove any other anti-virus programs from his machine before activating Avast!?

John

It is a known fact that having multiple av utils on one system mostly lead to prblems. So yes remove any av before installing another.