Microsoft Exchange for IM and Presence Service on Cisco Unified Communications Manager, Release 9.1(1)
Introduction to IM and Presence Service Integration with Microsoft Exchange
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Introduction to IM and Presence Service Integration with Microsoft Exchange

Overview

Microsoft Exchange integration with the IM and Presence Service allows users to incorporate their calendar/meeting status in Microsoft Outlook into their availability status on the IM and Presence Service.

Deployment Types

The following sections identify the types of deployments available and describe each.

WebDAV

WebDav (Web Distributed Authoring and Versioning) is an extension of HTTP that facilitates creating, changing, and moving documents on a server as well as editing properties of a file. WebDAV can be used to access Microsoft Exchange mailboxes over HTTP connectivity. Each folder, message, calendar event, contact, and so on, has a URL that can be used to access it. The IM and Presence Service can use WebDAV to gather information on calendar events. WebDAV is deprecated in Microsoft Exchange 2010 and beyond.

Figure 1. Microsoft Exchange Integration with WebDAV over the IM and Presence Service

Exchange Web Services

Exchange Web Services (EWS) is a newer set of Web services that allow interaction with Microsoft Exchange mailboxes and contents over HTTP. EWS provides access to much of the same data that is made available through Microsoft Outlook. It provides more services and is more robust and easier to use than WebDAV, as well as being better able to handle exchange-specific data. EWS moves several responsibilities from the client computer to the server.

Figure 2. Microsoft Exchange Integration with the IM and Presence Service over EWS

Microsoft Exchange Calendaring States on the IM and Presence Service

Microsoft Exchange integration with the IM and Presence Service allows users to incorporate their calendar/meeting status in Microsoft Outlook into their availability status on the IM and Presence Service. The table below shows the reachability mappings, and how the IM and Presence Service correlates the status of meetings (as shown in Microsoft Outlook calendar) in the availability status of users on the IM and Presence Service.

Table 1 Aggregated Availability State Based on Calendar State

Microsoft Outlook State

IM and Presence Service State

Free/Tentative

Available

Busy

In a meeting

Out-of-Office1

Away

Away2

Away

1Microsoft Outlook 2003 and 2007

2Microsoft Outlook 2010

Presence Gateway Options

You must configure a Microsoft Exchange Server as a Presence Gateway for calendaring information exchange on the IM and Presence Service. The Presence Gateway to Exchange enables the IM and Presence Service node to reflect the availability status of the user on a per-user basis.

Restrictions and Limitations

The following are restrictions and limitations for integrating the IM and Presence Service with Microsoft Exchange:

  • You can either configure one WebDAV Server or multiple Exchange Web Services (EWS) servers. You can not mix WebDAV and EWS server types in your deployment.
  • You can add, update, or delete one or more EWS servers with no maximum limit. However, the Troubleshooter on the Presence Gateway Configuration window is designed to only verify and report status of the first 10 EWS servers that you configure.
  • This release of the IM and Presence Service does not support the Exchange autodiscover service. The autodiscover service assumes that a load-balancing mechanism is already in place across the Client Access Server (CAS) or servers.