My first intuition would be that perhaps you're behind some form of router or firewall? There's another thread located
http://www.daniweb.com/forums/showthread.php?t=638that seems to be related to this.
You said that quite a few others in your office are experiencing the same problem? It's possible you're all behind the same firewall?? Do you have any programs such as Norton Personal Firewall installed? or McAfee Firewall?
Another idea is that this is related to cookies. It seems that the way you say you cannot access web based email accounts, etc. these are sites that store personal information in the form of cookies to keep you logged into their website. Check your Internet Explorer preferences - they may have been reset when you upgraded. Also check your Internet Explorer security settings, also in the Preferences menu.
Hope some of this gives you some ideas! Good luck.
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