Microsoft Outlook Calendar Integration for the IM and Presence Service, Release 15 and SUs

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Updated:: March 18, 2026

New and Changed Information

The following table provides an overview of the significant changes to the features in this guide up to this current release. The table does not provide an exhaustive list of all changes made to the guide or of the new features up to this release.

Table 1. New Features and Changed Behavior in Unified Communications Manager and IM and Presence Service
Date	Description	See
February 05, 2026	Added steps to configure Calendar Out of Office information.	Configure Calendar Out of Office Information
October 01, 2024	Added the steps to configure Office 365 support for Government URLs in the Configure a Presence Gateways feature.	Configure a Presence Gateways
October 01, 2024	Added note for the minimum version for TLS 1.3.	Configure a Presence Gateways

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