Which protocol is used for communication between Cisco IM and Presence and Microsoft Exchange Server?

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Refer to the exhibit.

Which protocol is used for communication between Cisco IM and Presence and Microsoft Exchange Server?
A . POP3
B . IMAP
C . EWS
D . XMPP

Answer: C

Explanation:

Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab11/collab11/presen ce.html