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_USERSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging Subsystem
Outlook 2013:
HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0OutlookProfiles