Office 365 users cannot see on-premises free/busy

Posted on Posted in Office 365

Issue My Customer introduced an Exchange 2013 server into the Exchange 2010 based organisation, however found that Inbound Free/Busy tests failed using Office 365 based OWA. The W3SVC IIS logs revealed the following error – the line has been shortened for clarity POST /autodiscover/autodiscover.svc/WSSecurity & ASAutoDiscover/CrossForest/EmailDomain//15.01.0225.018 – 500 0 0 124 Cause The Exchange 2013 […]