Are you trying to update a mailbox record in Microsoft Dynamics CRM 2013 on-premise and getting the "Allow to use Credentials for Email Processing" field grayed out like the following? If yes then this article will help to enable this option. The "Allow to use Credentials for Email Processing" option under mailbox in Microsoft Dynamics CRM 2013 allows us to store credentials to access email services. If we are using Microsoft Dynamics CRM 2013 on-premise then we need to configure IFD to enable this option, but if you don't want to configure IFD we have the following workarounds to enable it.
In this article we will discuss the first option. We need a SSL certificate to bind with the CRM website. As we are using our demo VPC, we have created a wild card certificate. Use the following procedure to bind a SSL certificate and configure HTTPS binding to the CRM website.
Now navigate to the mailbox record in CRM, you should get "Allow to use Credentials for Email Processing" enabled.
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