Can't get to OWA

We need someone to remote into our Exchange Server (2007 running on Windows Server 2003 R2 SP2) and get OWA running again. It was working earlier in the week, but some of the certificates expired. We successfully implemented some of them, but I believe we are still missing a key SSL certificate for OWA to work. That may or may not be the only issue. Multiple people have tried to get it to work without success - however, none of us are Exchange admins and just don't have the knowledge or understanding to fully solve the problem. This is the error when visiting our OWA site ([login to view URL]): SSL connection error Unable to make a secure connection to the server. This may be a problem with the server, or it may be requiring a client authentication certificate that you don't have. Error 107 (net::ERR_SSL_PROTOCOL_ERROR): SSL protocol error This is an urgent need as we have users who only use OWA to access their email, as well as users who use it on their phones.