Error or prompts for credentials in Outlook when Outlook Anywhere is disabled
In Microsoft Outlook, you may experience one or several of the following issues:
- When you start Outlook in an existing profile, you receive the following error:Cannot start Microsoft Outlook. Cannot open the Outlook window.
- When you start Outlook or create a new Outlook profile, you are repeatedly asked to enter credentials.
- If you click Cancel at the credential prompt, you receive the following error message:The action cannot be completed. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.
This issue occurs because Outlook Anywhere is disabled in your protocol settings.
To fix this issue, run the following cmdlet in the Exchange Management Console.
For more information about the Set-CASMailbox cmdlet, see the following Microsoft TechNet article:
Set-Casmailbox <mailbox> -Mapiblockoutlookrpchttp:$false
You can verify that Outlook Anywhere is disabled by checking the protocol settings in ADSI Edit for the user:
If there is a 1 following the fifth § character, as is shown in this screen shot, Outlook Anywhere is disabled.
If there is a 0 following the fifth § character, or if there is neither a 0 nor a 1, Outlook Anywhere is not disabled.
For more information about protocol settings and ADSI Edit, see the following TechNet article:
rpc over http rpc/http
Article ID: 3120192 - Last Review: 12/02/2015 20:24:00 - Revision: 3.0
Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2010