Originally posted here: http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/69f1fc11-ea5f-4f61-8243-d47f54622dc8 and re-posted to the Admin forum for Premier support consideration. Basically I have a need to script changing the primary UM extension for a UM enabled mailbox when the user's phone number changes. I had a nice little app set up (using PowerGUI) for the folks that manage the phone system to make these changes under 2007. Now, we're converting to 2010 and I need to get that same functionality working for the migrated users. I've tried diffent methods of scripting the update of the UM extensions, both by changing the existing UM proxyaddress, and by removing it and adding a new one, using the examples given in the online documentation. Neither method will change the primary address. I can get it to change by disabling and re-enabling it in the EMS that installed with Exchange 2010, but not in a generic PS session with the Exchange Management modules imported. Everything else I've tried in that environment works, except for enabling or disabling a UM mailbox. Can anyone shed some light on why this doesn't work?[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

I can reproduce the same symptom in my lab (E14 RTM on win2k8 SP2) by using TechNet article The output is always: “WARNING: The command completed successfully but no settings of ‘14RTM.com/OU/User1’ have been modified.” The issue has been reported for investigation. I’ll keep posting at here if there’s any update about itJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

Thank you.[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Any updates?[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Sorry for the delay, please use the example below to change the UM extension: $mbx = Get-Mailbox tony.smith $mbx.EmailAddresses.Item(0) ="eum:22222;phone-context=MyDialPlan.contoso.com" Set-Mailbox tony.smith -EmailAddresses $mbx.EmailAddressesJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com