Calendar Integration with Microsoft Outlook
This feature allows users to incorporate their calendar and meeting status from Microsoft Outlook into their Presence status on the IM and Presence Service server. If a user is in a meeting, that status will display as a part of the user's Presence status. This feature can be configured by connecting the IM and Presence Service to an on-premises Microsoft Exchange server or to a hosted Office 365 server.
For details on how to configure calender integration with Microsoft Outlook, refer to the document Calendar Integration with Microsoft Outlook for the IM and Presence Service at http://www.cisco.com/c/en/us/support/unified-communications/unified-presence/products-installation-and-configuration-guides-list.html.