I use 2007 microsoft outlook and am unable to open my email by double clicking. It does open by left/click/open. I also noticed when I opened control panel to check my system, the double click would not work and I got an alert tone each time I tried.
Note, my family has 3 separate identities set up on this computer and this problem is only occuring under my identity. The other two identities do not experience this problem at all. Thanks!