This article shows a scenario where the Dynamics 365 app button will be inactive, like grayed out, in the Outlook menu. This may be caused just because of the View Reading Pane configuration in your Outlook client.
However, you may still see the button active when you create a new email or an appointment:
In Outlook, your View Reading Pane must be Right or Bottom for the button being active:
Hope this helps.
Configurations notes:
This post is based on the following configuration:
Dynamics 365 Online Version: 8.2.1.411
Outlook 2013
Please notice there may be other reasons why this button could be inactive, see the following forum discussion.
Software Engineer specialised on Microsoft Technologies with experience in large projects for different industrial sectors as developer, consultant and architect.
I enjoy designing and developing software applications, it is my job and one of my hobbies. I’m interested in design patterns, new technologies and best practices. Making those part of the ALM process is a great challenge.
Since 2008, I have been working with Microsoft Dynamics 365 (CRM back then), the Power Platform and Azure. I customise and extend the platform to provide tailored solutions and integrations based on service-oriented architectures and messages queuing.
Motivated by community events and contributor in blogs, technical books, open source projects and forums, I was awarded Microsoft Business Applications Most Valuable Professional (MVP) for 7 years.
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7 thoughts on “Dynamics 365 Outlook App button inactive”
Also remember that it is mailbox specific so if you are looking at a shared mailbox then the app won’t be available. Nice article Ramon, saw this at a client quite recently.
@ramontebar 
Thanks Ramon. Very useful to know.
Also remember that it is mailbox specific so if you are looking at a shared mailbox then the app won’t be available. Nice article Ramon, saw this at a client quite recently.
Was struggling to understand why 1 user out of 200 had this button grayed out. You saved me. Thanks!
Hi Ramon,
This is a nice article!
Do you know the reason behind of the Dynamics 365 button being disabled whenever reading pane is turned off?
Hi Arnaldo, thanks for reading my article. Good question, I have no idea 🙂
Worked for Me Tank you very much !!!!
thank you Ramon. it worked.