comcast hosted exchange server accounts no longer accessible with outlook 2013
We have used Outlook 2007, then 2010 and then 2013 (as part of Office 365) since available to connect to our comcast hosted exchange accounts.
All have functioned flawlessly until comcast upgraded their Exchange servers to Exchange 2010 from Exchange 2007 at the end of last week.
I can connect android devices with ActiveSync using the new server address in DNS settings, but can't connect with Outlook 2013 from either of two laptops running Win 8.1 Pro. The web Outlook access functions normally.
The autodiscover type account creation in Outlook fails, with "unable to make encrypted connection to server, hit ... to proceed with unencrypted connection" or similar error.
Manual creation of the email account done through the control panel fails, as no connection to the server can be made.
I called comcast tech support, and was told that only Outlook 2010 was supported, and that they were told not to provide any tech support for Outlook, and they recommended that I try Outlook 2010.
The 32 bit Outlook 2010 that I downloaded from comcast installed, but couldn't successfully connect, either.
Microsoft TechNet or Office.com search indicates that they only recommend that one version of Outlook be installed on a system.
What is the problem? Outlook 2013 is compatible with Exchange Server 2010, just as it was with 2007.
This has wasted a large amount of time, and I would appreciate some assistance in resolving this problem.
Have also tried deleting the existing Outlook profiles on each system. An IMAP account from the ISP I have at home (charter, which splits our city with comcast), but not the exchange account can be added back, with the same errors noted above.