Error: You need more memory or system resources. Please close some Windows and try again.

Problem when trying to open the mail app in the control panel or if opening outlook with many profiles.

To resolved rename the following key to something else.


Outlook 2010 and older:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem
 Outlook 2013:
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles