BB email to Outlook Help

Here is my problem, I receive an email to my Blackberry Pearl then a few seconds later I get in on my computer. I am using Outlook for emails on the computer. The problem is if Outlook is turned on the moment my computer gets the email I cannot do anything with the email in my blackberry. I can�t open an attachment or forward it. So when I leave my office I have to turn off my email on the computer so I can use the BB. I have to have something configured wrong but I can�t figure out what it is. HELP PLEASE!!!!!