I am having the same problem constantly. I am on Windows 7, Outlook 2010 and IE8. When I mouse-over the link, the correct URL is displayed. However, when I click,
http://"/ shows up in the URL field at the top of the IE screen. I have tried numerous fixes without success. I have ensured IE is the default browser, I tried one fix-it-for-me from microsoft. And I have re-registered several .dll files. I also edited a couple registry entries. No luck.
Has anyone ever found a fix for this?