Preventitive measures

With the amount of bad-code written for MS sys, I am considering installing alternative mail & browser programs for our network. It's foolish to think that employees will not do email and surf on the job. So to that end, I inquire about the interface of Eudora and Opera with Norton. They both seem to have an edge in features over Outlook and Explorer. My feeling is that any and all measures to insure our systems day to day function is time well spent. Outlook is too vulnerable to use safely in a network invironment.Eudora does not have some of the weak points of Outlook, and Opera is almost self-contained. There is some question about the Norton AV interface with these programs. I'm new at this position and doing alot of OJT.