The caller must be at least a member of role: UserCreators.

<request>
		<data/>
		<procedure>
				<execute namespace=' Unified Messaging 2007 Provider' procedure='EnableUMMailbox'>
						<executeData>
								<identity>Fabrikam\user1</indentity>
								<umMailboxPolicy>PolicyID</umMailboxPolicy> 
								<preferredDomainController>dc01.fabrikam.local</preferredDomainController>
								<extensions >
										<extension>5551212</extension>
										<extension>5551213</extension>
								</extensions>
								<propertyList>
										<property name="propertyName">
										<value>return value</value>
										.
										</property>
										.
								</ propertyList>
						</executeData>
				</execute>
		</procedure>
</request>

• Hosted Messaging and Collaboration version 4.5
• Hosted Messaging and Collaboration version 4.0