Symptoms:

Your IMAP import profile is not importing any images. You can open your Processing Server -> Tasks and check if there are failed import tasks. When you double-click on the failed task there is a short log that says: 

Failed to open the file 'file_path' using embedded Office application. Exit code: 4.

Cause:

All import tasks are performed by the user, under which the Processing Station Service is running. By default, it is a Network Service account. This user doesn't have enough permissions to perform a task. 

Resolution:

1. Click Start > Control Panel > Administration Tools > Computer Management. The Computer Management window opens.
2. Click System Tools > Local Users and Groups > Groups. The list of groups opens.
   
3. Double-click the Performance Monitor Users group. The Performance Business Monitor Users Properties window opens.
   
   
4. Click Add. The Select Users or Groups window opens.
   
   
5. In the Enter the object names to select field, enter the user account name to whom you want to assign permissions, and then click OK.
   
   
6. Click Apply, and then click OK.
7. Repeat steps 3-6 for the Performance Log Users group.