1. Browse CRM Organization in web.
2. CRM -> Settings -> Customizations - Customize the System -> Opportunity entity -> Forms -> Insert tab - Add a section and a sub grid showing all emails.
3. Configure CRM in configuration wizard and synchronize CRM.
4. Open the Opportunity record in Outlook -> Navigate to sub grid -> Select single crm email record and do a right click, select "Open in a new window".
5. It will open a outlook form with no content in it. (like a new outlook form).

It happens on every OOB entity which has a subgrid and when we try to open the record selecting it as "Open in a new window".

When we open the CRM email record by selecting "open in a new window" in Outlook configured with CRM it should show all the content of CRM in the outlook email form.