Hi,
We currently have an issue with EWS not working with Lync 2013 clients and were told by Sophos support that this should work in the 9.2 release.
Unfotunately I am not in a position to test the beta of 9.2 to verify that it does indeed work with the new SSO feature of WAF. Is anyone who is testing the beta and using Lync 2013 able to confirm that this has been resolved?
Many thanks.
More details on the issue are here: utm webserver protection ews. Though it originally talks about Mac version of outlook, the issue connecting to exchange EWS URL is the same.