Outlook's Crashing with Exception Code 0xc0000005? Here’re The Fixes Guide to troubleshoot Outlook Error Code 0xc0000005 Online0xc0000005 is a common Outlook error. This error can happen in the system for a variety of reasons. The lack of RAM space could be the root of the problem. Error messages can happen if the DLL (Dynamic Link Library) that underpins the software's operation is missing or faulty.