Some users have experienced the following behavior after deploying CRM 2015 for Outlook:

• Outlook loads slowly
• The Outlook icon on the Windows task bar blinks repeatedly
• The cursor flashes between busy and ready

Using the solution described in this forum post can fix this issue, if it happens to you. The problem is a missing config file in the Dynamics CRM program files folder.

1. Create a new text file and rename to “Microsoft.CRM.Application.Outlook.WebFormsHost.exe.config.” Be sure to remove the .txt file extension.
2. Move to the C:\Program Files(x86)\Microsoft Dynamics CRM\Client\res\web\bin folder
3. Restart Outlook.

This behavior has been observed in the CRM 2015 for Outlook Update 1 client.