Your company uses Office 365 for all users.
The company has the contoso.com SIP domain.
You need to change the SIP address of a user named User1 from userl@contoso.com to user2@contoso.com.
You must achieve this goal in the minimum amount of time.
What should you do?

A.
Modify the PrimarySmtpAddress attribute of User1.
B.
Add a proxy address to the properties of User1.
C.
Create a service request.
D.
Modify the sign-in status of User1.
The answer is not correct. Answer should be B. https://social.technet.microsoft.com/Forums/en-US/1178579b-15e2-4ddb-a221-df93c590558f/changing-sip-address-with-minimum-amount-of-time?forum=ocsmanagement
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Michael, read the link you posted. It reinforces why the answer is C.
A – Exchange only property will not affect SIP
B – Adding a proxy address will not affect SIP
C – Will get it done, but not in a hurry
D – Will not do shit
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