Article ID: 116505, created on Jul 19, 2013, last review on Sep 10, 2014

  • Applies to:
  • Operations Automation 5.5
  • Operations Automation 5.4


A customer cannot create an Exchange mailbox or distribution list in POA Control Panel, the corresponding background task fails with an error message like that below:

The proxy address "" is already being used by "hosting.local/Microsoft Exchange System Objects/sales". Please choose another proxy address.

There is no other Exchange mailbox or distribution list with the same email address in the customer's subscription in POA.


Most likely, the customer created another Exchange object (e.g., a mail-enabled Public Folder) with a conflicting email address directly on the Exchange server using Outlook or OWA. So, POA knows nothing about the existing email address and allows the customer to create a mailbox or distribution list with the same email address in the Customer Control Panel. Finally, the background task 'Create mailbox with E-Mail Address' or 'Create distribution list' fails with the error message about a conflicting email address.

One may use the ADSIEDIT.msc tool on the Active Directory Domain Controller to confirm that the Exchange object has a conflicting proxy address; the full path to the AD object is given in the error message in the failed task in POA Task Manager:

Your text to link here...


Resolve the conflict: consider either converting the conflicting Public Folder to the mail-disabled one, or changing its email address (and proxy address as well) to another one that does not conflict with the email address of the mailbox you want to create. Then, re-run the failed task in POA.

Search Words

Microsoft Exchange System Objects/

caea8340e2d186a540518d08602aa065 5356b422f65bdad1c3e9edca5d74a1ae ac82ce33439a9c1feec4ff4f2f638899 2554725ed606193dd9bbce21365bed4e 5b048d9bddf8048a00aba7e0bdadef37 e12cea1d47a3125d335d68e6d4e15e07

Email subscription for changes to this article
Save as PDF