Have not received emails since update

When I came into work Monday morning (July 20th) there had been an automatic update and I have not received mail through the Thunderbird Client since then. Looking through previously asked similar problems I tried the following: Allowing through Windows Firewall, Completely disabling our company's anti-virus (Sophos, pain in the... you know), and logged in through our company's web browser to attempt to check and alter the server settings. I have not had any luck, so now I come asking for help.

As I mentioned, I am able to check my mail through our webmail (I used RoundCube specifically), and I have access to all of the other options on the webmail server. I want my Thunderbird back! Any suggestions?