Field Notice: FN74365 - Cisco Unity Connection Unified Messaging with Microsoft 365 - Voicemail Stored in Cisco Unity Connection Will Not Sync with Exchange Online (Outlook) Due to EWS Deprecation - Software Upgrade Recommended

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/support/docs/field-notices/743/fn74365.html

Published

2026-04-15

Updated

unknown

Accessed

2026-10-02

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• Field Notice FN74365 (revision 1.0, 15 April 2026) lists Unity Connection 14 (all releases through 14SU6) and Unity Connection 15 releases earlier than 15SU4 as affected by the Exchange Online EWS deprecation for unified messaging with Microsoft 365. in context
• FN74365's remedy is to upgrade Unity Connection to 15SU4 or later, which uses Microsoft Graph API for Office 365, before 1 October 2026, when Microsoft begins blocking EWS requests from non-Microsoft apps. in context
• Per FN74365, affected systems fail to synchronise voicemail with Exchange Online and the admin console reports 'Failed to Connect to Microsoft endpoint using https://outlook.office365.com'. in context
• FN74365 states the EWS deprecation applies only to Exchange Online; there is no change to EWS for on-premises Exchange Server. in context

Cite this source record

APA

WarmTransfer. (2026, April 15). Field Notice: FN74365 - Cisco Unity Connection Unified Messaging with Microsoft 365 - Voicemail Stored in Cisco Unity Connection Will Not Sync with Exchange Online (Outlook) Due to EWS Deprecation - Software Upgrade Recommended. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-fn74365-cuc-ews-deprecation

BibTeX

@misc{warmtransfer-cisco-fn74365-cuc-ews-deprecation,
  title  = {Field Notice: FN74365 - Cisco Unity Connection Unified Messaging with Microsoft 365 - Voicemail Stored in Cisco Unity Connection Will Not Sync with Exchange Online (Outlook) Due to EWS Deprecation - Software Upgrade Recommended},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-fn74365-cuc-ews-deprecation},
  note   = {Cisco Systems, accessed 2026-10-02}
}