About 3 weeks ago, we had a Comcast outage in our area and after our internet access was restored, I have not been able to access the Comcast server to get my email via Outlook for Mac 2011. I am able to get my Comcast email on my iphone and directly through the Comcast server. Our internet access works fine, although it's slow. I worked with Comcast technical support and with Microsoft and concluded that I needed to update to Office for Mac 365 and did so today. I still cannot access my Comcast email via Outlook 365. I receive the message "Unable to Sign-in. Check your credentials and try again". When I try adding my Comcast mail account through System Preferences/Internet Accounts, it just spins and is not able to add the account. I have run anti-virus software and I updated to OS High Sierra. None of that has helped. Any ideas?