Exchange Online Hybrid - Autodiscover works for Outlook 2016 clients, but fails for Outlook 2013


We have a hybrid Exchange environment with Exchange 2010 and a small number of mailboxes migrated to Exchange Online. We are using ADFS for authentication.

However, for mailboxes that have been migrated to Exchange Online, the Outlook 2013 autodiscover process fails.

Oddly, Outlook 2016 autodiscover works fine. Autodiscover also works fine for on-premise mailboxes. Users can authenticate to Outlook web fine via ADFS.

Outlook 2013 seems to have a problem at the point it is redirected to (normally the final step after first contacting on-premise CAS server). It then shows a logon prompt, however no credentials are accepted. If credentials are provided, they fail with 0x80004005. Screenshot below.

Troubleshooting attempted:

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asked on Server Fault Jan 26, 2018 by AdamR

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