If your Outlook 2010 is crashing due to a culprit add-in, then the only possible way is to start it in safe mode and remove the add-in. Apart from add-ins, there could be hundreds of other reasons why your Outlook is crashing. In all cases you will need to start Outlook 2010 in safe mode.
So how would you start Outlook in safe mode? Go to Start Search, type Run, and hit Enter. Once the Run dialog window is open, you can type any one of the four switches.
outlook /safe – Starts Outlook without Microsoft Exchange Client Extensions (ECE), the Reading Pane, or toolbar customizations. Component Object Model (COM) add-ins are turned off.
outlook /safe:1 – Starts Outlook with the Reading Pane off.
outlook /safe:3 – Starts Outlook with Microsoft Exchange Client Extensions (ECE) turned off, but listed in the Add-In Manager. Component Object Model (COM) add-ins are turned off.
outlook /safe:4 – Starts Outlook without loading outcmd.dat (customized toolbars).
For some reason, /safe:2 switch is not included so typing it will give you ‘wrong switch’ error.
These switches can also help us in pinpointing the exact problem. Suppose you can run Outlook in /safe and /safe:4 switch, but not in /safe:1 and /safe:3 switch, this means the problem is occurring in the customized toolbar.
Please note that these switches work for Outlook 2007 as well. For more, if you are using Firefox, we have a guide to launch it in Safe Mode too.