I have been plagued with this problem for quite some time and on multiple computers at my work. I'm pretty sure its a virus that only allows access to secure website like owa and will give a page cannot be displayed message for any normal ones. The funny thing is that it only affects a certain profile on the machine and if I just delete the profile and create a new it works fine. I believe we have seen this problem on 5+ machines at different sites which have no connection to each other other than email through owa. I haven't seen any correlation between the affected computers and our anti-virus, Kaspersky, doesn't pick it up. I just want to know if anyone else has seen this and if they have suggestions for blocking it because even though it is easy to fix it is still annoying. Thank you in advance!