I use an Outlook 2013 client attaching to Exchange 2010.
Recently opening almost any of my calendar items causes Outlook 2013 to crash. This happens to pretty well any calendar entry that has been created externally (ie downloaded from a website, or posted automatically from my online CRM system) and I think it sometimes happens for locally created calendar entries too.
I have two client PCs with Outlook 2013 on, and the same happens on each so I don't think it is a local problem.
As soon as I double click on an effected calendar entry Outlook crashes and then eventually restarts.