When integrating Cisco Unified Presence with Microsoft Exchange, which interface is used for communication between the Cisco Unified Presence server and the Microsoft Exchange server?

A.
OWAWebDAV

B.
XMPP

C.
XML over HTTP

D.
XCPOWA

E.
XCPWebDAV

Explanation:
OK. StudentGuide Volume 3 Page 5-35
Cisco Unified Presence communicates with the Microsoft Exchange Server using Outlook Web Access (OWA), a Web-Based Distributed Authoring and Versioning (WebDAV) interface that is available on the Microsoft Exchange Server.