[AB] Shawbiz webmail Security certificate error

Hello, I am having a problem logging into Shaw's business webmail (webmail.shawbiz.ca) or (webmail.shawcable.com). I am getting an invalid security certificate from the sites. I can only access the business webmail from these sites, Shaw.ca's webmail seem to only be for residential customers. This happened last year around the same time and I had to make an exception for the site. I can still access my email through outlook. I need to know if this is happening to other people, or if my computers (it is happening on multiple computers, on different ISP's) have been compromised, or if shaw's connection has been. Or if this is even a legit site, I was told by shaw to use these sites in the past to access my account information and webmail. Without the https I get a 403 forbidden error, and with I get an invalid certificate. The https is added automatically when webmail.shawbiz.ca is typed into the URL bar. I have deleted the old certificate, cleared my cache and site preferences to no avail. Thank you