Below post lists steps to set up Outlook App for Dynamics CRM in preview mode:
Go to Office 365 Administration settings-> Admin
Pick Add-ins ad highlighted in the screen.
Click + Icon and Pic Add from the Office store:
Search for CRM for Outlook App:
Come back to list of apps and see that CRM for Outlook App is disabled
Enable the App and hit save.
Go to system settings and accept the preview feature:
Set up Server side Sync for the mailboxes you want to enable the App as per my earlier post:
Note: Do not forget to enable Synchronization for Tasks, Contacts etc. using Server side sync on the mailbox.
See the Outlook App for CRM in Action:
Hope it helps and Happy CRMing!