We have seen CRM Outlook Client users receive the following message:
A Microsoft Dynamics CRM window was unable to open, and may have been blocked by a pop-up blocker. Please add the Microsoft Dynamics CRM server to the list of sites your pop-up blocker allows to open new windows: servername
CRM Pop-up Blocker Error: CRM Pop-up Blocker Error
We fixed this by running the Automated fix from Microsoft to solve the issue Hyperlinks not working from Outlook.