Field Notice: FN74367 - Cisco Unified Communications Manager IM and Presence Rich Presence Based on Microsoft 365 Calendar Integration Will Not Get Updated - Software Upgrade Recommended

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Updated:February 6, 2026

Document ID:FN74367

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High

Impact Rating:

High

First Published:

2026-Feb-06

Last Published:

2026-Feb-06

Revision:

1.0

Cisco Bug IDs:

CSCwp67350

Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Products Affected

Affected Software Product	Affected Release	Affected Release Number
Unified Communications Manager IM and Presence Service	-
Unified Communications Manager Updates	14	14
Unified Communications Manager Updates	14SU1	14SU1
Unified Communications Manager Updates	14SU2	14SU2
Unified Communications Manager Updates	14SU3	14SU3
Unified Communications Manager Updates	14SU4	14SU4
Unified Communications Manager Updates	14SU4a	14SU4a
Unified Communications Manager Updates	14SU5	14SU5
Unified Communications Manager Updates	15	15
Unified Communications Manager Updates	15SU1	15SU1
Unified Communications Manager Updates	15SU1a	15SU1a
Unified Communications Manager Updates	15SU2	15SU2
Unified Communications Manager Updates	15SU3	15SU3
Unified Communications Manager Updates	15SU3a	15SU3a

Defect Information

Defect ID	Headline
CSCwp67350	Implement migration from EWS to Microsoft Graph API in IM&P

Problem Description

Cisco Unified Communications Manager IM and Presence (Unified CM IM&P) will not get calendar status from users of Microsoft 365 Exchange beginning October 1, 2026, because Microsoft is retiring Exchange Web Services (EWS) APIs.

Microsoft 365 calendar integration with Cisco Unified CM IM&P allows users to incorporate their calendar and meeting status in Microsoft Outlook into their availability status on the Cisco Unified CM IM&P Service. This integration can be accomplished by connecting the Cisco Unified CM IM&P Service to Microsoft 365 through EWS.

Background

Microsoft is deprecating EWS for third-party applications to integrate with Microsoft 365 and replacing it with Graph API. Starting October 1, 2026, Microsoft will block EWS requests from non-Microsoft apps to Microsoft 365.

Microsoft announcement: Retirement of Exchange Web Services in Exchange Online

Note: This applies only to Microsoft 365 and Exchange Online (all environments). There are no changes to EWS in Exchange Server. EWS will continue to be fully supported for Exchange on-premises mailboxes.

Problem Symptom

Beginning October 1, 2026, Cisco Unified CM IM&P will not get calendar status from users of Microsoft 365 Exchange.

Calendar status is a specific presence status that represents the free/busy status of users based on their calendar.

A screenshot of a computer

With EWS retirement in Microsoft 365, Cisco Unified CM IM&P will not be able to incorporate In meeting and Out of Office calendar statuses as the overall user status. 

Workaround/Solution

Solution

Cisco Unified CM IM&P Service will migrate to Graph API in releases 15SU4 and later. Upgrade to Release 15SU4 before October 1, 2026, as shown in the following table. Upgrading is the only option to sustain calendar integration.

Cisco Unified CM IM&P Release	First Fixed Release
14, 14 SU1, 14 SU2, 14 SU3, 14 SU3a, 14 SU4, 14 SU5	Migrate to a fixed release
15, 15 SU1, 15 SU2, 15 SU3	15 SU4

Revision History

Version	Description	Section	Date
1.0	Initial Release	—	2026-FEB-06

For More Information

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