Microsoft is deprecating EWS

[amith80kumar]

Microsoft is set to deprecate EWS with applications that integrate with O365. We use Cisco Unity for OAuth authentication which uses EWS. Microsoft has said that we should going forward use Microsoft Graph API however Cisco AS team is saying that Graph API is not compatible with Cisco Unity. Can someone tell me how we can replace EWS and what changes we need to do for Cisco Unity integration

[Brad Magnani]

Microsoft hasn't communicated any new formal deprecation of EWS as a whole, only certain API's within it, which aren't used by CUC.  Per MS's announcement last year, they changed their initial stance on removing it and are still keeping it around after the feedback they received: https://techcommunity.microsoft.com/t5/exchange-team-blog/upcoming-api-deprecations-in-exchange-web-services-for-exchange/ba-p/2813925

"We strongly urge our ecosystem partners accessing Exchange Online data to migrate to Microsoft Graph APIs."

They're going to try suggesting Graph, but nothing changes with CUC as it stands now.  The only change made recently with how CUC functions with O365 was the implementation of Client Credential grant flow instead of ROPC.  This is explained in the 14SU3 release notes: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/14/readme/b_14su3cucrn.html#Cisco_Generic_Topic.dita_b23c4c0e-0e88-459d-91ca-7833fcffbd8b

Cisco works closely with Microsoft, so until you see something from Cisco indicating changes with the integration, everything is business as usual.

Hope that helps,

Brad

[wilson.gonzalez07]

Has there been any change on this from Cisco? Microsoft announced they are going away from EWS and we need to use Graph. What Unity version will be used for this? 

[Roger Kallberg]

It will be in version 15 SU4 or SU5 according to the discussion I’ve had on this with our account team. That is expected to be released in early 2026. Per information shared MS isn’t deprecating the parts CUC uses until October 2026.