If Outlook 2010 displays this error message, it is usually due to a program that is blocking the MAPI interface
The login was canceled because system resources were not available in time. Please try again.
MAPI 1.0 [000004C2]
In this case, add-ons such as CTI applications often block the interface. XPhone or Blackberry are popular candidates for this. Manual termination or reinstallation usually helps.