Initialization Failed with Office Mail App (OMA)

Initialization Failed with Office Mail App (OMA)

  • Article ID:100042727
  • Last Published:
  • Product(s):Enterprise Vault


Launching Enterprise Vault Office Mail App (OMA) within Outlook Web Access (OWA) fails with an initialization failed error message. 

Note: Launching Office Mail App (OMA) within Outlook works without issue.


Error Message

A Wireshark / Fiddler trace can be performed on the end users workstation while generating the initialization failed error. Locate and then doubleclick the ExecuteEwsProxy line.




The following server response will be displayed  "The remote server returned an error (404) not found."





This behavior has been observed in Exchange 2013 CU18/CU19 when the Exchange Mailbox Server role is separate from the Exchange Client Access Server role.

Note: To validate the error, an 404 error will be found on the EWSProxy call in the C:\inetpub\logs\Logfile\W3SVC1 IIS log on Exchange Mailbox Server.






Please contact Microsoft Support for further assistance.



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