Error: Unable to open the mailbox: Reason: Unspecified error. Support Info: ecNoReadRight
Posted by Jim Beveridge, Last modified by Jim Beveridge on 12 November 2016 06:19 PM

(Applies to: Epicenter Server)

Symptom: You receive an error message in Epicenter Server similar to this:

12/16/15 09:57:33 [Global Address List] Unable to open the mailbox for Xxxx Yyyyy <>. Reason: Unspecified error . Support Info: ecNoReadRight

Most often seen with Outlook 2010 and Outlook 2013 on Office 365.

Cause: Usually caused by Outlook using the HttpMapi protocol, which does not support third party applications like Epicenter Server.


Please check the following. These instructions only apply to Office 365 and other Hosted Exchange environments. This error typically does not happen with dedicated Exchange Servers.

  • Make sure you can open a remote mailbox in Outlook using the instructions on this page.

    If you can't open it, then follow the instructions above to configure Full Access to mailboxes.

  • Look in Tools | Exchange Privileges and make sure it's set to Full Access.

  • If you are using Outlook 2010 or Outlook 2013, then you are probably running into problems with HttpMapi. Follow the config instructions on this page:


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